Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca4be05115c9274…

MALICIOUS

PDF

55.7 KB Created: 2020-08-08 05:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a44259dda5499f9d652692176df9b24 SHA-1: fef96a286b4eae09cf146bc3a068efc92eaeacf2 SHA-256: 6ca4be05115c9274a86cf694dd86b9dbfb0491d71141f5c43560decbff8a643d
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, disguised as a free English course. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests an attempt to distribute malware or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=curso+de+ingles+gratis+pdf+completo
    • http://files.dorkygringo.com/uploads/1/3/1/4/131482819/dezukapud.pdf
    • http://gupiwe.ms-kyles-kids.com/uploads/1/3/1/0/131070450/sumutox-lizakolibi.pdf
    • http://files.marjorieorourke.com/uploads/1/3/2/3/132302816/lefigokopuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/2130/8828/files/the_believers_authority_andrew_wommack.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/35223617322.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/27197316899.pdf
    • https://cdn.shopify.com/s/files/1/0430/9742/4026/files/katumetabeleb.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/laguk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/xikulesujamirasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/jopudutiroletimulomukunab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5312/0664/files/joxepifenavugupa.pdf
    • https://cdn.shopify.com/s/files/1/0446/4757/9811/files/chain_of_infection.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/aquatic_plants_list_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/ringtones_from_youtube.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/romigetoralik.pdf
    • https://cdn.shopify.com/s/files/1/0430/1262/0447/files/rosewa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/james_stockdale_courage_under_fire.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_off00009a38.bin
8aa75358b95c5957d8ed6560c36dab94ae096dee5d1608f4d98b3e97ce4c8b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A38 5380 bytes
font_01_sfnt_off0000ac6d.bin
04dc014a7bfc14032a969899250d381557b2b0aba0178652ec3180ae568bb360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6D 11204 bytes

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