Malicious PDF — malware analysis report

Static analysis result for SHA-256 9790c3f75e14ae45…

MALICIOUS

PDF

49.3 KB Created: 2020-07-30 08:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93e0db251b8f05e304efd575616fb05 SHA-1: d0053217c08962e94862339ab4a57c985fa2b45f SHA-256: 9790c3f75e14ae45a6266048726ee4741633fbd6862c5701566f9edcd4806833
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.ru/pify?keyword=tecnicas+de+recoleccion+de+informacion+de+los+procedimientos+pdf
    • http://files.sammileedavis.com/uploads/1/3/1/8/131872238/9d031d5.pdf
    • http://files.poseidonwater.com/uploads/1/3/0/7/130740231/8353684.pdf
    • http://files.graceandfaithboutique.net/uploads/1/3/1/6/131606526/dediga_xesitab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9292/5852/files/60162034201.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/xanesunewanutegojivulifuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/lidelofakodutelira.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/70388481952.pdf
    • https://cdn.shopify.com/s/files/1/0440/5529/8213/files/53178989146.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/31245546771.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1779/files/xusunoluwutiwiri.pdf
    • https://cdn.shopify.com/s/files/1/0439/8887/7470/files/72128822340.pdf
    • https://cdn.shopify.com/s/files/1/0439/5093/2123/files/judifusesuguwoxowutobaroz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008070.bin
98b0b48a4162d279262f9305ceab7d2268cf76dc13ec6b54998eeb0d28fe69c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8070 5036 bytes
font_01_sfnt_off00009166.bin
8b3c54f6f609adcae178fbd93d11cba5fcff1dbe882a5147c3fb0a939ba0db32
pdf-font-stream PDF embedded font (sfnt) at offset 0x9166 11948 bytes