Malicious PDF — malware analysis report

Static analysis result for SHA-256 9915a15cdc79094b…

MALICIOUS

PDF

45.6 KB Created: 2020-08-17 10:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ad7b4cd91a4a71bacf4bae2ac22600 SHA-1: e3d1788fccad83a83fc235f97f6c21fd6502ec1f SHA-256: 9915a15cdc79094b0ea5bd5039199f125ea9cb81803d481eb295141abd1ecf3e
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=bengali+song++free', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting a lure to external content.

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=bengali+song++free
    • http://files.francoisharray.com/uploads/1/3/2/3/132303219/bapafolu.pdf
    • http://jufudo.mlmedicalsupplies.com/uploads/1/3/1/0/131069934/zorefonujivixo.pdf
    • http://dujuren.gilbertparksandrecreationfoundation.org/uploads/1/3/2/7/132740564/8448655.pdf
    • http://files.snydersbuildings.com/uploads/1/3/1/4/131453985/9791931.pdf
    • http://files.sylviarockwell.com/uploads/1/3/1/4/131483019/zuduvofud.pdf
    • https://cdn.shopify.com/s/files/1/0435/3222/2615/files/animation_studio_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/nerusuworigilipavidelo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/41523935503.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/78377953959.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/16584902759.pdf
    • https://cdn.shopify.com/s/files/1/0435/3517/1736/files/62122537906.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/pajusu.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_off00006d97.bin
d821c7c73345f0f93aae42b31abd8ce1522862e1c9300f590ef66b2575957771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D97 4984 bytes
font_01_sfnt_off00007e9d.bin
585decda6881397a623ce3d8809ca67640a717be708f5e3356efdae8e46b5790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9D 13856 bytes

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