Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1b2158c5d2ff39…

MALICIOUS

PDF

39.5 KB Created: 2020-08-21 11:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4663a1fdf8a33d7b3aee577279180c4e SHA-1: 38f63564d86e41e68d7a2821aeab259f1f147807 SHA-256: 6a1b2158c5d2ff3910b92f687f96b5b87628b1916254e7afa0410091a79203c8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users with a keyword related to Excel spreadsheets. The document body also contains this URL, suggesting an attempt to disguise the malicious link. The presence of numerous Shopify URLs, while many are marked benign, indicates a potential link farm strategy to obscure the primary malicious destination.

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.com/pify?keyword=columns+in+excel+spreadsheet
    • http://files.nwkenpo.com/uploads/1/3/0/7/130739590/funidopozisizodotad.pdf
    • http://files.glassmermaids.com/uploads/1/3/1/4/131453215/75c7263b03cbc12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/29609263785.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/domingo_garcia_belaunde.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/baworosaxapeteve.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/20525845925.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/sarazijifuxusakewutogoge.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/gojufinamisifewikedomifuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/72768572529.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/abscesso_perianal_antibiotico.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/general_chemistry_mcquarrie.pdf
    • https://cdn.shopify.com/s/files/1/0439/2773/2379/files/imperative_sentence_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/98642818150.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_off00005e2a.bin
a5193a643c218751726c25d913d7df97459260d7ecd21cc27e82ee356aad017d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2A 5284 bytes
font_01_sfnt_off00006fef.bin
3b63ed64cd529f7325733f67089808c6173899fe3b25575e7b4432f64912fd4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEF 9828 bytes