Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ec3160a0dd21e1…

MALICIOUS

PDF

49.6 KB Created: 2020-08-08 06:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 026db830089c677eb5d90b86fd586609 SHA-1: 50a0c5fdff5555dd51f436ea88a512e261f25fe9 SHA-256: 72ec3160a0dd21e144c878bca223f90716b514430b908adc50365564d0496a27
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=walter+sisulu+biography+pdf. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, suggesting a link farm or phishing lure. 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.com/pify?keyword=walter+sisulu+biography+pdf
    • http://files.kcmoorefoto.com/uploads/1/3/1/0/131070651/23e5c75d.pdf
    • http://files.myphotographybyjess.com/uploads/1/3/1/8/131857315/favofelifepod.pdf
    • http://files.bensawyermusic.co.uk/uploads/1/3/2/7/132740218/kelupotamevivok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/nursing_drug_handbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/4775/3640/files/78470029390.pdf
    • https://cdn.shopify.com/s/files/1/0448/0575/0946/files/javascript_validate_url.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/saxezadasusogavatedo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/72434813120.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/fake_report_card.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/exerccios_de_anlise_combinatria_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/the_brain_fog_fix_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4264/files/famavugowovawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/likowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/temibiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/dezolakezetu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/37891173500.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_off00008332.bin
29049eb470dbf87960e32136b0c09360737f33a52ebefe52881c097b17673fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8332 5556 bytes
font_01_sfnt_off00009622.bin
e4d3f404234c442e778f5c85d3a8af4bdc2ff42282f9d62b2eed6317298b2235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9622 10468 bytes

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