Malicious PDF — malware analysis report

Static analysis result for SHA-256 536cc0186ab81f7e…

MALICIOUS

PDF

44.1 KB Created: 2020-08-18 23:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2807343f5cdd2b147d202ae93d94c0fa SHA-1: 738df2c4e67772e8ccabdf2e1e223175b1a9b49e SHA-256: 536cc0186ab81f7ec4b2b1672c95f2fae831491df63768dbf6e0a046a1738f5f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a deceptive call-to-action and multiple embedded links, including one pointing to a known malicious redirector infrastructure. The document body, though corrupted, contains text related to 'change pdf file size online free' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.ru/pify?keyword=change+pdf+file+size+online+free In PDF document text
    • http://nifiwim.ledlightstrading.com/uploads/1/3/1/4/131453284/7556952.pdfIn PDF document text
    • http://files.campwannacombac.com/uploads/1/3/2/3/132303238/fudivefamibed.pdfIn PDF document text
    • http://nazenone.t-ris.com/uploads/1/3/0/7/130740069/8598353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0760/4896/files/lajetuduruvutax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/cathtrisme_urtral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1297/2963/files/titipazenarupeboxef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67768868558.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/birthday_banner_template_ppt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/76327955253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/charging_pad_for_android.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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 5084 bytes
SHA-256: 367bfe54a08010b502058ad0eeb25fc43c52c4fe3a516e0c81b6941f4bec0ee9
font_01_sfnt_off00007332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7332 10180 bytes
SHA-256: 3a405792ffa2b69d61eafe58fa45f820cb046bf8fa10a2cc9213d559556879e6
font_02_sfnt_off00009601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9601 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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