Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3615b1c6de6e18…

MALICIOUS

PDF

40.3 KB Created: 2020-08-17 02:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05c22b3e89331b8c6932e2b0b399372 SHA-1: 41b1f93c01157e6c6a71179f1f81bd2fa71c33d1 SHA-256: cc3615b1c6de6e18a1c3382ac037c084182c27a2b21004364513358569cba8e4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'business letter writing format examples' and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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=business+letter+writing+format+examples
    • http://files.iliasvasilos.com/uploads/1/3/1/4/131409755/8f8353f9096834.pdf
    • http://zaxoriz.hoaks4wheeldrive.com/uploads/1/3/2/3/132303382/fba0245b9.pdf
    • http://jekugad.inescapableclothing.com/uploads/1/3/1/4/131454029/zuwonigijipi-guzejol-xowopolunom-rasolaguf.pdf
    • http://files.stjameshaubstadt.com/uploads/1/3/1/3/131397971/676123.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/canoscan_9000f_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8137/5648/files/nunevijowizin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/wavadosuradidaliwa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/61711361436.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/11953643628.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3169/files/6345163867.pdf
    • https://cdn.shopify.com/s/files/1/0452/0571/7141/files/15050734811.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_off00006023.bin
7a67e9b30489755c398d9ba4fc4a4dff800f4ec36170234323f0092ef0cb65b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6023 5432 bytes
font_01_sfnt_off00007299.bin
9591d8432de2bef4b4c4a77a97f622da4877bc83020e6838533cfe26b52e53a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7299 9964 bytes

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