Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22246e0f0b5330e…

MALICIOUS

PDF

40.9 KB Created: 2020-08-16 15:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1134327dc41ffa90b1ed6868082753 SHA-1: 2b6dc4a0b67aa2fd7bdcb9c30e0f5958a21433a8 SHA-256: e22246e0f0b5330e16822dac418fce375a6a32a40c917b57898f70c1cc4b7291
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for a voice training course. The presence of numerous other links, many hosted on Shopify, indicates a link farm designed to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=voice+training+course+pdf
    • http://files.intimatesmallweddings.com/uploads/1/3/1/8/131871488/a6a1aeeccca9.pdf
    • http://files.missionlenders.net/uploads/1/3/2/8/132814371/musodidime.pdf
    • http://files.headstart-upshur.org/uploads/1/3/2/3/132302863/9522922.pdf
    • http://gamusiko.youthmakeadifference.com/uploads/1/3/1/4/131406149/7164516.pdf
    • http://files.californiacalisthenics.com/uploads/1/3/1/6/131608016/vajipekimema-kunaxenegam-viwaxoban-zejodajamebeduv.pdf
    • https://cdn.shopify.com/s/files/1/0451/1091/9321/files/alter_ego_a1_french.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/90696669780.pdf
    • https://cdn.shopify.com/s/files/1/0444/3914/2566/files/abscesso_renal_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/pejuxemeteferekuxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/ejercicios_resueltos_de_nomenclatura_de_alcanos.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/41468685756.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/wubeluke.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/equus_africanus_asinus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2735/8115/files/87799251437.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/tidufimisip.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/64301264459.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_off00006179.bin
d057f86613a3cb87ab2c3ac6daa1529530e857eea1ee7f30c09d82a7e65189aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6179 5256 bytes
font_01_sfnt_off00007366.bin
d934ac8bd0fb1424a8ffcb88c514cf250001fb63b029fddfb3b703bb89bfb54e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7366 10412 bytes