Malicious PDF — malware analysis report

Static analysis result for SHA-256 494046899817420b…

MALICIOUS

PDF

57.1 KB Created: 2020-07-31 15:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ddddf32dec9cce671c5d8a3b3a2893d SHA-1: 630f5a82150e47ed68a108537c917697422c1fe7 SHA-256: 494046899817420b816bec8a934ea6ef967a85e28f39e30dbedc76eec210f82e
152 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, specifically linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO manipulation or phishing. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, particularly the one pointing to 'ttraff.cc', are highly suspicious and likely part of a malicious redirection chain. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious redirection attack pattern.

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=tinker%2527+s+construct+modifiers
    • http://files.thefirmuk.com/uploads/1/3/0/7/130775427/sexojojuverewot.pdf
    • http://files.marilynsyme.com/uploads/1/3/0/7/130775484/japuli-fotedej-pafunepibigide-vekuwakunaw.pdf
    • http://files.fairlingtonfins.org/uploads/1/3/1/3/131379439/doranijiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7859/files/wuzamotiroboga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/fulagekumusivexirokul.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/99102320729.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/96680289994.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/39431056002.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/54271238888.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/93117093950.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/vowavilatiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/76025395941.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/
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086d2.bin
ed52ec2d5ed4846d52887ceea7cc2abf2197bed34e0305849f03c0f60c0b2151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D2 4852 bytes
font_01_sfnt_off00009737.bin
d66ee1bae75d2e499eda22828fc05b7fec57e90872ad0d53c1d2731b1f45f7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9737 10128 bytes
font_02_sfnt_off0000b9f6.bin
c173533953e38dc856b6063969c7564b9e29d147d4a68dbe0a5b7163fa281438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 18304 bytes

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