Malicious PDF — malware analysis report

Static analysis result for SHA-256 6600ea3bab218068…

MALICIOUS

PDF

45.2 KB Created: 2020-08-04 16:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f96bdaf1b38a021e2fb1c0f27391ebff SHA-1: 2699bfbd01b064d6a9d88b877724549181068950 SHA-256: 6600ea3bab218068330fcc068abed9836edf5d668bd79bbde66da31f2db7abff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, one of which, 'https://ttraff.cc/pify?keyword=class+score+sheet+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text fragments suggesting it is disguised as a 'class score sheet pdf'. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=class+score+sheet+pdf
    • http://files.polishmesilly.com/uploads/1/3/2/7/132712661/970331.pdf
    • http://gakawezo.art4himstudios.com/uploads/1/3/1/4/131453054/8061901.pdf
    • http://files.botkinscommunitypark.com/uploads/1/3/1/6/131606260/rebex.pdf
    • http://files.texasangiesadventures.com/uploads/1/3/1/3/131397973/74c108131b86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1539/5738/files/avery_templates_18660.pdf
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/58997722702.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4909/files/52332629590.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/426174872.pdf
    • https://cdn.shopify.com/s/files/1/0437/6163/1389/files/big_time_rush_oh_yeah.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/70797253209.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0630/files/toyota_land_cruiser_fj40_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/dalavub.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/asce_7-_10_full.pdf
    • https://cdn.shopify.com/s/files/1/0435/5053/9940/files/87064795829.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/7285225056.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/pixuwezen.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/54306013176.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/47387598901.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_off00007252.bin
40ac545a799c45ced653ce9cad77f930ee15fa3bacda3d2eef781dab5982a8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7252 5148 bytes
font_01_sfnt_off000083c7.bin
0baf62a1ace84bb6ea91f5cfa14a95decf027c03a49878fe566e5f861e47122f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C7 10504 bytes

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