Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3c3f9192d62f79…

MALICIOUS

PDF

44.7 KB Created: 2020-08-24 03:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da57c6160ecb0319222af62621c1735c SHA-1: 78870ca02c86f5ee308e29f26a1d8441e27e7553 SHA-256: 8f3c3f9192d62f79ca3968d09cd9632e20486b94740319e4e1cf122c54ef34a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=driver+odbc+access+64+bit', is designed to lure users into downloading malicious content. The document also features a link farm pointing to numerous PDFs hosted on Shopify, with one such link being 'https://cdn.shopify.com/s/files/1/0427/6381/3020/files/guzarapow.pdf'. The ML classifier strongly flagged this PDF as malicious.

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=driver+odbc+access+64+bit
    • http://bipolenur.thepavlich.com/uploads/1/3/1/3/131383737/6516883.pdf
    • http://files.frostedfarmsnc.com/uploads/1/3/0/7/130776218/gironivud_vizemel_jupuzojifun_dugano.pdf
    • http://wapagufiw.hammerartgallery.com/uploads/1/3/1/1/131164250/6328058.pdf
    • http://files.cbinderyservices.com/uploads/1/3/0/7/130775866/ba6ecb.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/guzarapow.pdf
    • https://cdn.shopify.com/s/files/1/0448/5431/3122/files/anemia_de_clulas_falciformes_diagnostico.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/diwogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/75487170322.pdf
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/xuguxuzafiwetono.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/14892536735.pdf
    • https://cdn.shopify.com/s/files/1/0428/1886/3260/files/xuwinotebire.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/sikegesidig.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/lunibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/71805850118.pdf
    • https://cdn.shopify.com/s/files/1/0440/1758/2230/files/digoz.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_off000064a2.bin
edbf86dcdd962ffae89cb97326942b9f563c7a7e783c662aee1653f7e66d8fdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A2 5024 bytes
font_01_sfnt_off000075ce.bin
a371bde5a68537f57e0c7469f7e78f76f3cf5d349a69da57cbe709b583d2fa12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CE 9952 bytes
font_02_sfnt_off000097e4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E4 4324 bytes

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