Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac9388cef7b7c50…

MALICIOUS

PDF

76.6 KB Created: 2020-08-03 13:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca5f90e61043c5ef95cb9ed182adebe SHA-1: fcd4eaa0a772fa08e6d9bfd6fad1a1b8eb82a99e SHA-256: fac9388cef7b7c505fcff2162ac30011689dfadc36b3c97b21959be95a8a5010
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to the presence of a link to a known malicious redirector infrastructure. The document body contains obfuscated text and a URL that appears to be part of a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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=restriction+enzymes+pdf
    • http://files.michaelmillermemorialfoundation.com/uploads/1/3/0/8/130874067/791098.pdf
    • http://files.copperfieldfarmfl.com/uploads/1/3/2/8/132814136/f9215ab1d58bf4.pdf
    • http://files.freehillblades.com/uploads/1/3/1/4/131483281/tirovepeposel.pdf
    • http://files.grewbuilding.com/uploads/1/3/2/6/132681670/47fec686.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/wererat_dnd_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/free_email_providers.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/taveg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/papal.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/marukivudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/68198978131.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35117459625.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6337/files/zavox.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/48094551866.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/42138498283.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/66481539949.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/wulubonalejutafijumi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/dibis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/murotelewinunekor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/wojar.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_off0000e721.bin
28c4577c4eb79fd6d284beab13306ed3def684380d3f92da3de0522def4cbae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 5216 bytes
font_01_sfnt_off0000f8e7.bin
a0d38fd14966ad530e8d116079f2313cc9752c798d4b02cd3069b2a3718ed610		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 13896 bytes

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