Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5ad670f5174a13…

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 04:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7138773021f419c79555c607d9817625 SHA-1: 2311c2d209ab3203084b8fd73ba964729df80410 SHA-256: fa5ad670f5174a13a6fb9720f1f6eb2f9e6a0a49ccec7f23f41b0cc446bca5ce
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'aptitude test with answers pdf' and the malicious URL itself, suggesting a lure to trick users into clicking the link. The redirector URL is the highest priority IOC.

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.cc/pify?keyword=aptitude+test+with+answers+pdf In PDF document text
    • http://files.thomastrevethan.com/uploads/1/3/1/3/131398555/7750438.pdfIn PDF document text
    • http://files.soul-blossoming-therapies.com/uploads/1/3/1/3/131380258/lusux.pdfIn PDF document text
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.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/1/0431/7747/6253/files/wudokuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6412/1752/files/73954106541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64830269039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/zoxixabejewatan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/4435599795.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/gaxorefunirakukisijipevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/lumatuxanerotikaxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/77494356969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/mamesoxatabuminineruduke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/zelaxusafomijoloxugesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/42341707368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1153/8072/files/aviculture_moderne_au_burkina_faso.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 5180 bytes
SHA-256: d90f71906de218255323b3389bdae5a7f5dab7c44898896dce7919ef2a6f95ee
font_01_sfnt_off000070dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 10588 bytes
SHA-256: 028b8f4307e4ceb089a4e9297bf354af662db17b718352afecdf23dc5976444d

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