Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cc4d09129cad1f…

MALICIOUS

PDF

41.8 KB Created: 2020-08-16 22:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf612170eabb790e1e9474d200e70347 SHA-1: 414ac27c973f5a882c4173ed01c1310b41c7fd17 SHA-256: 05cc4d09129cad1f51d85d2453a054a8070c44305559608273becaab7f7a1c3c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is a redirector that appears to be disguised as a search result for educational materials. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a larger link farm operation.

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.ru/pify?keyword=hodder+cambridge+primary+maths+stage+3+pdf
    • http://files.pawsclawsanimalrescue.com/uploads/1/3/1/6/131607005/18a962b2c72f657.pdf
    • http://files.sunshinecoastpiano.ca/uploads/1/3/1/4/131437515/f11c91df7d365ad.pdf
    • http://lunig.isemsun.com/uploads/1/3/0/8/130874482/bcf8531e40dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/74196692427.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/ariens_7524_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/zuludokavovaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/zezuxitetipopu.pdf
    • https://cdn.shopify.com/s/files/1/0450/4082/8566/files/zelda_n64_rom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66916333827.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6231/files/45100186944.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/59886412138.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/49739808443.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/most_ed_rpg_android_games.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/634636378.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e97.bin
b10e0325b5ed609ca94af916a21af18c69a59afe24a892a94ba03cb89bdb26c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E97 5904 bytes
font_01_sfnt_off0000628e.bin
07343865c0195b72cbf86647fcf20ffb0c9ac23a6df9b4a46d00a7687ef7ba6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 9996 bytes
font_02_sfnt_off00008501.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8501 16164 bytes

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