Malicious PDF — malware analysis report

Static analysis result for SHA-256 725c84842557d555…

MALICIOUS

PDF

52.7 KB Created: 2020-08-04 22:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2ca8a5afc155c195c4b48cb98d2457 SHA-1: ba5eea6a3c18701b1e7a48c0bad1aea18e020012 SHA-256: 725c84842557d5558f569f0aa98b7beb029385a2c402c7ba64727b6dedf6e9a3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=absolutismo+ingles+pdf'. Additionally, it exhibits characteristics of a PDF link farm with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of a malicious redirector suggests an attempt to lure users to a compromised site for further exploitation.

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=absolutismo+ingles+pdf
    • http://files.shophealthygoddess.co/uploads/1/3/1/3/131382243/787e750a97.pdf
    • http://wakumen.haitihap.org/uploads/1/3/0/7/130739430/bonepova_faduz_sumukija.pdf
    • http://files.juliajawor.com/uploads/1/3/1/3/131384429/7755502.pdf
    • http://files.body-knowledge.com/uploads/1/3/2/6/132681824/2094315.pdf
    • http://files.balancedbodysolutionsok.com/uploads/1/3/1/4/131407459/3003400.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/dimunevelaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/vojuwadudutodunivor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/70636592377.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/kowesufarubedef.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/64584391122.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdf
    • https://cdn.shopify.com/s/files/1/0449/3633/1419/files/minecraft_mangle_skins.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/98174779935.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5264/files/35737858352.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/antisocial_personality_disorder_treatment_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/tujeposafikomudazexuwan.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/85687626278.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/runidiwojinowisu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008619.bin
26cd4b7c216739b2855cf77b0882590b680568829e9e0af8426bb36846f61eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8619 3184 bytes
font_01_sfnt_off0000916e.bin
b7ae1dd8b84659d580f5818f93fa75c36e7d111d64ab90186b5664e17c7e3bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x916E 5184 bytes
font_02_sfnt_off0000a304.bin
448587440090ef89fe1fb7513fb01bfb4bfc58f4904a8c7282cfdd269a2cef3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA304 10000 bytes

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