Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3e2f48131ab3bc…

MALICIOUS

PDF

102.1 KB Created: 2020-08-15 05:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c751ac91446ebeb7814eb3086f80384c SHA-1: dc6f7a4852b29f57d489c34a9d39beea3943aac6 SHA-256: 1a3e2f48131ab3bcd5bde62bc7d98b7a96a2ba9a35c356ec33997fd6e1543c4b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users with a USCIS citizenship-related keyword. The document also features a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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=uscis+citizenship+questions+and+answers
    • http://files.maplehillbluegrass.com/uploads/1/3/2/3/132303194/5849670.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/buhner_healing_lyme.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/nozopepuwikere.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/97143186553.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3882/files/wifewazivudezojuxebek.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0421/files/activity_ratio_formula.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/96681751884.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/kabikatunalolifixelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/lakafulazove.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/gotevomajaxikono.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/nomudemokoposopud.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_off000151d9.bin
f5c7f3968ad52195a567fcf800efd675a528e16e8721a05c845ff5664d3734eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151D9 5388 bytes
font_01_sfnt_off00016438.bin
91cfe63c622876e50c0a2216ad86ced8561c2e5ca380dbb7dfd55f66554a5e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16438 11940 bytes

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