Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea26b71621aaf90…

MALICIOUS

PDF

59.4 KB Created: 2020-08-19 05:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e604651b8ddb64db136e0866e22bd8ce SHA-1: 87685358559a5645f219120e32a82f2e078960b8 SHA-256: 5ea26b71621aaf906ebdb3b542dc498a84b54420762d043d875c318277238388
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirection and a link farm, specifically pointing to a redirector URL. The document body and embedded link artifacts also contain the same redirector URL, suggesting a social engineering lure to download or view content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=reduce+pdf+file+size+adobe+reader+online In PDF document text
    • http://files.inthemixdjsnh.com/uploads/1/3/0/7/130775205/b1980377c3.pdfIn PDF document text
    • http://files.anxietyannarbor.com/uploads/1/3/1/6/131606876/sobuv-lebizo.pdfIn PDF document text
    • http://files.psych205.com/uploads/1/3/1/3/131397987/biwotoresez-popisu-lefarog.pdfIn PDF document text
    • http://kosijiku.azqualityremodeling.com/uploads/1/3/1/0/131070374/1913904.pdfIn PDF document text
    • http://ropavotuw.internetadvert.net/uploads/1/3/2/8/132814930/jebaluvawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7664/9127/files/fuzibomegozudarip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8471/5934/files/abrsm_grade_1_theory_past_papers_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/ragemifupovaligare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/83606032040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/lugimovemalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/23844529530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/56804738462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7565/7125/files/calendar_template_free_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/les_miserables_abridged.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000859e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859E 6424 bytes
SHA-256: 120dfd7c7977cfb9a90e0c19aa24ce80f3ad63f69756627d616fe21accc03e95
font_01_sfnt_off00009580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9580 5348 bytes
SHA-256: a5c39b44f1da8f1acb684d52c9240dac439f44c93a469e074425cafe9218a704
font_02_sfnt_off0000a7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C0 10128 bytes
SHA-256: f20156bdda1f9508d00b47e7c03138e05913443d59500c20aed023020e97c8fd
font_03_sfnt_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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