Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f1697246be33c1…

MALICIOUS

PDF

38.9 KB Created: 2020-08-06 11:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94de699e55b0c6105ffb1d2635757ed9 SHA-1: b75b7a78ab03b413d615d631329392bb748a14ec SHA-256: 15f1697246be33c196ee9b96359f46090f1224ece2f3d27fa30af48de1ec50e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains URLs that appear to be part of an SEO link farm, suggesting a tactic to artificially boost search rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=adjectifs+francais+exercices+pdf
    • http://files.gregbrownportfolio.com/uploads/1/3/1/6/131637357/3552b.pdf
    • http://files.heatherwittmezzo.com/uploads/1/3/0/9/130969310/4a131d7c6.pdf
    • http://files.compassclay.com/uploads/1/3/1/4/131454114/3440063.pdf
    • http://files.jagregina.com/uploads/1/3/1/8/131871535/lurusut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7673/0528/files/jizanorelulik.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/zimesuvinobexewetigalus.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/yoshi_story_rom.pdf
    • https://cdn.shopify.com/s/files/1/0434/9234/3970/files/memivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/67111426025.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/55627681178.pdf
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/29687149336.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/meio_ambiente_livro.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/77324759108.pdf
    • https://cdn.shopify.com/s/files/1/0428/9141/1615/files/ethernet_controller_driver_windows_xp.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a28.bin
8701ede476e93a0203ce17f00ccdfe086b3139d0ad819d61317bbcbd84d46dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A28 5248 bytes
font_01_sfnt_off00006c22.bin
e3c28104f6755ff8ac0224a1161c29c60a32bdb3f96413f19580011c1b75793c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C22 10192 bytes