Malicious PDF — malware analysis report

Static analysis result for SHA-256 8334c286ecbd87e3…

MALICIOUS

PDF

67.9 KB Created: 2020-08-23 00:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 01ee8ad398fa6dd569524b02f26dcd37 SHA-1: 4bc78a78583a1b59916e3df4f1ea83dd6c3b8f78 SHA-256: 8334c286ecbd87e37473ea4502b66ae468d5a24256f2a5aa034827f2215f0daa
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service that is flagged as malicious. The document body and heuristics indicate a lure for a free download, likely leading to malware. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.ru/pify?keyword=s8+navigation+bar+apk+no+root In PDF document text
    • http://files.merkthose.com/uploads/1/3/0/7/130776661/ditowiwimusuguroj.pdfIn PDF document text
    • http://files.clevelandtheater.org/uploads/1/3/0/8/130814430/fc15537e9b27.pdfIn PDF document text
    • http://lanipib.thegreatlife.com.au/uploads/1/3/2/6/132695366/kobito.pdfIn PDF document text
    • http://files.thecourageousstepsproject.org/uploads/1/3/2/8/132814611/6c0a2abcbdb4.pdfIn PDF document text
    • http://jakeje.socalseas.com/uploads/1/3/0/8/130814328/sudejebinopi-dobipi-wulovepasimir.pdfIn PDF document text
    • http://www.mafiapaidapps.com/2017/12/s8-navigation-bar-pro-no-root-simple.htmlIn 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/1/0435/5702/8001/files/13811579634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/53854244110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8279/0552/files/legendary_markings_feral_heart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9183/5546/files/foxepagutafedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/4948/9308/files/avermedia_game_capture_hd_ii.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0698/3333/files/amos_20_software_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2005/0586/files/4698690877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/accomplishment_report_intramurals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/86530658231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6583/4658/files/ftse_all_world_ex_us_fact_sheet.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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 5340 bytes
SHA-256: 397214fe7f0be064760428c6b8e82f64da7095766949b0170ec32adcc24b96b8
font_01_sfnt_off0000c643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC643 11840 bytes
SHA-256: 35c006e8274dcf77120ac50a934e9f67feb0a0e86a241948573a117165ca82bb
font_02_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 16204 bytes
SHA-256: 5e08925ead205efb7a3c6735982b36f87fce58b2f20f3c50188d1180594cb824