Malicious PDF — malware analysis report

Static analysis result for SHA-256 39629c4017577d5e…

MALICIOUS

PDF

40.3 KB Created: 2020-08-15 04:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 60726eedd252dbb09ce993365bed3deb SHA-1: 49c7f6a62c4751fbffcd2a5421b656c7948b336f SHA-256: 39629c4017577d5e15a523f9c409eeddec776ed5e1a554bd5dab3bb177a93511
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, also contains the URL pointing to the malicious redirector. The presence of a mass external PDF link farm suggests an attempt to manipulate search engine results or to distribute malicious content through a large number of seemingly benign links.

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.com/wb?keyword=conditional%20type%200%201%202%20exercises%20pdf%20with%20answers In PDF document text
    • http://files.andreavytlacilova.com/uploads/1/3/1/4/131438759/kevemikajezasil-manegizu-zefemafoxakeki-filubunexadi.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/1/0433/3728/5797/files/life_selector_credits_hack_download_2020d_2029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4432/9877/files/malesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0581/9550/files/65008873502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1793/5770/files/faritibavasixale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/grade_11_chemistry_textbook_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/98499848937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/49057611997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/10385129644.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 3

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_off00005205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5205 5640 bytes
SHA-256: 70e70d414606c9f5d8b9731f02937ff6ea3e779ec4143d8c4cde40fbd471d946
font_01_sfnt_off00006559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 9624 bytes
SHA-256: 3765a45ef20a4548e66569bcaaa3c33888d6f3e21296afd0cc7cf2de6bd6a70a
font_02_sfnt_off00008663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8663 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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