Malicious PDF — malware analysis report

Static analysis result for SHA-256 728e6b0eda95e537…

MALICIOUS

PDF

36.3 KB Created: 2020-08-20 19:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1b9382ab6444fb446c79d400678b21 SHA-1: 2f7dcce1b82e8d495c47e8bb75a583e7426daabe SHA-256: 728e6b0eda95e537df15dd8327775fac7cb5958eb1dd304fdc262b4127afb5fa
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=english-+albanian+dictionary+of+idioms+pdf'. The document body and embedded artifacts suggest an attempt to disguise malicious links as legitimate content, likely for SEO poisoning or phishing purposes. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=english-+albanian+dictionary+of+idioms+pdf
    • http://files.haas-jordan.com/uploads/1/3/1/4/131407823/vokoporovunume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/95809062799.pdf
    • https://cdn.shopify.com/s/files/1/0429/0111/0940/files/68627928248.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/14777031166.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/56271767933.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/pejamufejanubusawam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9989/files/jejobilopenapexate.pdf
    • https://cdn.shopify.com/s/files/1/0431/8137/5648/files/kigagudu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8975/6311/files/algebra_factorising_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/77580383859.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/7073620155.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/kafiwafuxipegikeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/82175551376.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/sample_conclusion_lab_report_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0441/2653/5832/files/guwevumizidinovupodi.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_off00004c41.bin
110bdbf677ee298dd24a0a2a504b52c701fcb5aac6e932fff114156c82e82885
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C41 5800 bytes
font_01_sfnt_off00005fd6.bin
c0396d930e588c2a8651550f3afc070b865fd4beb2ab8e559ab5783b2f25b16c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 10544 bytes