Malicious PDF — malware analysis report

Static analysis result for SHA-256 d831b5160f9dcdea…

MALICIOUS

PDF

83.4 KB Created: 2020-08-14 23:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c5a4858c10c1d5451876f957ecc39d SHA-1: e6e54e4ece942c68810991ae8ada9c227d45f828 SHA-256: d831b5160f9dcdea6c9acdbcef8295065ca86f9fbeab5fcf4f080933f9c5c33a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=google+sheets+histogram+labels'. This suggests the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact lure.

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=google+sheets+histogram+labels
    • http://files.michaelmillermemorialfoundation.com/uploads/1/3/1/4/131438111/nesaxugidivujej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/51062839227.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/62246159925.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0381/files/assam_tet_2020_syllabus_lp.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/zosexidepir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/68240864395.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/83273441923.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/mezipujofowimosew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/33415648220.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/tirumuremimawipevux.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/98174779935.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/vazusutajizumivopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0777/7702/files/mediocratie_alain_deneault.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e4.bin
3fcf66b8782b56d10cf709b968fa11bd93cdf9ad767a6f09cbe2c4f96a3a1194
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 4952 bytes
font_01_sfnt_off000101bf.bin
f27e52f0cecba60893cff3ad8c78374b464e2ea88c031dd9b40f7d0cb6dc7ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 15628 bytes
font_02_sfnt_off00013235.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 4324 bytes