Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b416757f640d55…

MALICIOUS

PDF

42.6 KB Created: 2020-08-12 09:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d9cafcef4a85a849c07eac695de7a9f3 SHA-1: 62650883e73e109a419f48e53dd32595536c93fc SHA-256: d5b416757f640d555a890192078bea8eb7e3f9e2b170cd99ef6c8f8febcf18c5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the suspicious URL, suggesting a lure to external content. The presence of multiple PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the ultimate destination.

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=defensa+nacional+peru+pdf In PDF document text
    • http://gapabu.avhscoreacademy.com/uploads/1/3/1/0/131070450/wutix.pdfIn PDF document text
    • http://sejub.pfcpid.com/uploads/1/3/2/6/132695569/viminujuvus.pdfIn PDF document text
    • http://romazujun.victoriamarini.com/uploads/1/3/1/3/131379874/wofosedolelefuni.pdfIn PDF document text
    • http://files.aflunky.com/uploads/1/3/0/9/130970016/6859e.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/1/0438/4233/8981/files/bilugamumotulebetowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/tina_fey_bossypants_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/tinoxitofewamimefixarono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2157/2008/files/charles_correa_belapur_housing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/fizogitadufuloj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1245/4557/files/dekerawodaribizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/8862363821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3809/7051/files/72201929979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6916/9054/files/attestation_sur_l_honneur_de_prise_en_charge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/36832671690.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
🗂 Part of campaign: avhscoreacademy.com 3 samples

Related samples 5

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_off0000669f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 5148 bytes
SHA-256: 986390f157891d97871e13adf98bbc0ae288f0d166ef0f417e5bbfa2c3b552e6
font_01_sfnt_off00007831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7831 10908 bytes
SHA-256: 046437080f22e2f5eb1a129244b472e4776a368fdc400ef22d2e003008ef6dea

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