Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16c5c4628b3384b…

MALICIOUS

PDF

42.5 KB Created: 2020-08-07 02:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edb58bc100e8152b0b0c76c86b517f88 SHA-1: 474da699d5d6cbdba9356aa8a61ba3be97498b40 SHA-256: b16c5c4628b3384be320298829cc1160f7182c3c1762ac9b6a9b5f1b54be6272
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve SEO and distribute the malicious payload. No scripts were extracted, and the PDF structure itself is the vector for the attack.

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=refrigeration+and+air+conditioning+technology+bill+whitman+pdf
    • http://files.wonderlandlacrosse.com/uploads/1/3/1/3/131379553/kimiworivi.pdf
    • http://files.somedaynewfoundlands.com/uploads/1/3/1/4/131454549/bememezaxu.pdf
    • http://zokivep.calleeavatein.us/uploads/1/3/2/6/132680813/jegepuj.pdf
    • http://files.juliehui.co/uploads/1/3/1/4/131438557/rakop-lovemepujebe-gavude-pilojetovumoren.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/vowevafigalutepudobumel.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/cara_download_dari_academia_edu_tanpa_login.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/33854179796.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/66637380133.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/cape_coral_fl_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/callan_method_book_stage_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/84063356374.pdf
    • https://cdn.shopify.com/s/files/1/0441/2263/6440/files/programming_arduino_simon_monk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/32651755767.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/53507733794.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_off0000664e.bin
fb6369002a07c827b34f4d953cfd50cb1a5f3c635ce4709db37674d3c43bfc9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x664E 5732 bytes
font_01_sfnt_off000079c5.bin
78b4c38e534c35c0e9f65068bbdec267c9db6e49f1cdc6c770c7605d6d0e79d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C5 10204 bytes