Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79aa2eacf24cf94…

MALICIOUS

PDF

45.6 KB Created: 2020-07-31 07:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be7ca6550155dae70176597cdaa3d136 SHA-1: 6852e432cd6cae156f06fe890eeec762b6de16a9 SHA-256: c79aa2eacf24cf945fd584c60aff2453b729d23e1f831151473f00a189e32de9
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a 'PDF SEO Link Farm', with a primary malicious redirector URL. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the heuristics clearly point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=apostrofe+en+ingles+pdf
    • http://files.summerconferenceportland.org/uploads/1/3/1/4/131453560/956c24d227.pdf
    • http://files.nothingtotriflewith.com/uploads/1/3/0/8/130814245/14173c26cc81e9.pdf
    • http://files.hempsteadxc.com/uploads/1/3/0/7/130739628/demojuvesogiwutife.pdf
    • http://files.jiasenart.com/uploads/1/3/2/7/132740371/patuwerovorusu-gomav-xigomul-pazifakoborozez.pdf
    • http://files.faithsphoto.com/uploads/1/3/1/3/131383665/sogibe.pdf
    • http://files.sum
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0432/2322/0392/files/wobijegoxis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/viretitorijewami.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/xodebemegilobef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27150836515.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3342/files/tugifolubireri.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/21182800175.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/55191485844.pdf
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/donufenitedamelizek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.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_off000072c4.bin
f0b4709cce66af296745a6722044ce6f3d929de7a6a367f7b4b40496aa3e933c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C4 4776 bytes
font_01_sfnt_off00008309.bin
bfcc7a8ddec3de3a2b7cb269d9d15c07c34fed6751353d987b3d5dc22d745712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8309 11356 bytes

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