Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c2d0ba2bc8acc9…

MALICIOUS

PDF

48.8 KB Created: 2020-08-21 10:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57204b47a74c9417e4f09c8a6c5c7858 SHA-1: 6759a21a4f60704f234377441370d3cbd9cd4c1f SHA-256: 64c2d0ba2bc8acc98f6c9909b8b27a1f01b2ce6b71829795dc47339dc801560f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users into clicking it. 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.ru/pify?keyword=bearshare+music+player+free
    • http://files.shadesproject.com/uploads/1/3/1/4/131407558/zewejimowuxo.pdf
    • http://bewonumoj.lauraslacesupplies.com/uploads/1/3/1/4/131453870/19a38dee67c3.pdf
    • http://files.oceanwisejourneys.com/uploads/1/3/0/7/130740517/vafetuwiza-gifawevaw-pedurojuva-fexevesomoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/lozotufokadizalorupezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/guliwovigofe.pdf
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/54562459841.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/juruxavenusofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/algerieinfo_journaux.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/wanufosenepalera.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/13172639209.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/14976681059.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/39657031528.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/34178919596.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007402.bin
08e0d8606ebf3aa5f88e73aac20209ee12b1843a2ddc4f919256584b01c38208
pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 4992 bytes
font_01_sfnt_off00008503.bin
a0c71e5ceea3efc74ebd4816dc7f9e4d585046ecfe7d93528f18ef7e69d52fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8503 10396 bytes
font_02_sfnt_off0000a890.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xA890 4324 bytes