Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60d1f5c6c571e49…

MALICIOUS

PDF

52.0 KB Created: 2020-08-12 06:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b852ce7cf3d4b0965505140a90dbc6 SHA-1: 4b1e14e6e2775c720d1ab7cec25a0c19211b2e17 SHA-256: a60d1f5c6c571e49c91e8bcc9d433d8b186a36c207eaf989d6cd4f7d6022eeca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful external sites, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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=atrybuty+%25C5%259Bwi%25C4%2599tych+pdf
    • http://rarotad.uevoices.com/uploads/1/3/1/4/131453109/256290.pdf
    • http://files.richardsrobots.com/uploads/1/3/1/4/131453896/8069365.pdf
    • http://files.catherineluckychang.com/uploads/1/3/1/4/131437725/4996099.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/social_security_form_ssa-_521.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/jezubizazanavomil.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/poradusukuvufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/getofudesum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7614/files/keto_diet_plan_for_weight_loss.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/gupudeguzomusovidufimed.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/refowejaguteforekukege.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/76451158037.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/afroasiatic_languages.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/76249018960.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/19557252965.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ea1.bin
1820853f31d8e185b83b5676fa676829e41016abb9629c2952b2edbb4d678e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 5076 bytes
font_01_sfnt_off0000900e.bin
edf6595e03573d2d25c3713f0ae49f0a0cd73904fd77b1a1b8be2c659624968c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900E 10980 bytes
font_02_sfnt_off0000b345.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 4324 bytes

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