Malicious PDF — malware analysis report

Static analysis result for SHA-256 990499196cc02149…

MALICIOUS

PDF

50.2 KB Created: 2020-08-06 23:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8c34ff3404cf3499788ae16f3fb12a58 SHA-1: 7a7758b927a50c8d4fa6faf568a334e14111b687 SHA-256: 990499196cc0214936ff0d77e0f2c5557343eba0b49bdda8ff75d0ec400ed7c3
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, masquerading as calculus formulas, with one primary link redirecting to a known malicious domain. This indicates a social engineering tactic to lure users to a malicious site. The document body itself is heavily obfuscated but contains the primary malicious URL.

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/pify?keyword=all+differential+calculus+formulas+pdf In PDF document text
    • http://files.titansofbrahma.com/uploads/1/3/2/8/132815181/131938abd330773.pdfIn PDF document text
    • http://files.6thairbornearmouredreconnaissanceregiment.com/uploads/1/3/1/3/131380213/35e89.pdfIn PDF document text
    • http://files.kilocharlieshootingrange.com/uploads/1/3/1/4/131452903/1f028f812b82a6.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/1/0432/0935/9517/files/86030083546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/17753854053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46824776831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/fumisefibofuvonoliwes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/99_magic_guide_rs3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/jokabufufatumamulopukas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/47612495490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/zojekibatakitezug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/kobewulil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/funciones_del_nervio_vago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/xaxolebilitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/nulufovujajemurosatazib.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 2

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_off00007d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D66 5288 bytes
SHA-256: 638a27c0c14ee2988ab5d0d5075c0517de30f7f377c5624799fb116040e69865
font_01_sfnt_off00008f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F51 14344 bytes
SHA-256: f1341e6470bb3b39a2b923a7f7c32cac9c1f41b6d01d60b0b07a3718f61dd6c7

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