Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8fb02a03c3ded2…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 14:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae1f949a64463c53188852e668a06f3 SHA-1: a4f994e6e1520111c8c44ef0e5d300638c5e94df SHA-256: 6f8fb02a03c3ded2527523ac456af4add41c849a6d91089494134abfb95e0ce6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The heuristic firings indicate it is a malicious redirector and part of a link farm, suggesting an attempt to drive traffic to malicious sites. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest a malicious intent to redirect users.

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=alain+deneault+mediocrity+pdf
    • http://files.st-theresa-earlville.com/uploads/1/3/1/8/131872079/be758.pdf
    • http://files.explorestanton.com/uploads/1/3/1/4/131453216/6741733.pdf
    • http://files.wristybiz.com/uploads/1/3/0/7/130775676/vokolurenem_wunadozami.pdf
    • http://files.minilivestock.com/uploads/1/3/2/7/132740415/38a223c.pdf
    • http://files.stellarindiana.org/uploads/1/3/1/4/131452887/worekuwetu-lusapazalu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3296/7318/files/22838830227.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/votelugodowukizeleto.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/6625735131.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/bleach_ichigo_final_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/3256/8220/files/veni_creator_spiritus_partitura.pdf
    • https://cdn.shopify.com/s/files/1/0434/4732/0728/files/7808695252.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/63630631070.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/77371713144.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/fularujubejumosejijuligu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4382/3511/files/bezufidomutovilemeseveguw.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/10166571485.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007240.bin
825713ffda0cee3ce6144e673afdd1eacf8448de9640b4f50e1819dadd8ca00b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7240 5212 bytes
font_01_sfnt_off000083f3.bin
5b894eb76494634f2032a1f129cff18062bb11662ccbdbcd5c225084e40295f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F3 10400 bytes

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