Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc987c55be72a50…

MALICIOUS

PDF

38.8 KB Created: 2020-08-09 16:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d90d5b8cc9f2c5e7cce309daa650b0 SHA-1: 8ab7069f1f39a5c09af2252bde3b153b3a9c0368 SHA-256: ffc987c55be72a50388ac038252b9860be21959c402e20713f07a425c964c8f9
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a PDF merge tool, aiming to send users to a harmful site. The ML classifier strongly indicated maliciousness, and the PDF structure includes a mass external link farm, suggesting a phishing or scam attempt. The document body contains the malicious URL and other links, reinforcing the 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.cc/pify?keyword=pdf+file+online+merge
    • http://files.sullivanvethospital.com/uploads/1/3/0/7/130774999/5ca02.pdf
    • http://files.shorecapmgmt.com/uploads/1/3/1/3/131383727/galesonenuk-kuriwanajosuku-vusopenejujog.pdf
    • http://files.kypba.com/uploads/1/3/2/7/132710592/galalezujuru-patovufove.pdf
    • https://cdn.shopify.com/s/files/1/0429/6369/7817/files/cfa_level_1_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/98550659331.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/43125499434.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77160317291.pdf
    • https://cdn.shopify.com/s/files/1/0437/2394/8183/files/jotuvawakexij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68736518606.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/hardest_hangman_words.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/industrialcraft_2_nuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/64939359070.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/54583217499.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_off00005bef.bin
cb04682c69727452df819178ff5ed614d8e99451c507c1b68718cc512532c27a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEF 4840 bytes
font_01_sfnt_off00006c51.bin
feb32a9852ef8837d1129b2dc956c0489158bf14f52cc49585f3e50ebe1107fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C51 10140 bytes