Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad942909b549680…

MALICIOUS

PDF

41.3 KB Created: 2020-07-31 04:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb587f5055b9585dffbe8af261b760e7 SHA-1: cad9e7f3c4880bfe27db9e4bf6356c6ef1b4300b SHA-256: aad942909b549680f0517ce13bbc5cf72e8c92ba14fcf595de12bd1b92a2ddfb
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/pify?keyword=cpr+bls+manual+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a link farm and malicious redirector strongly suggests a malicious intent, likely for phishing or malware distribution.

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=cpr+bls+manual+pdf
    • http://files.veropest.com/uploads/1/3/1/6/131606745/mapis.pdf
    • http://files.sanctifiedhome.com/uploads/1/3/0/7/130740412/f6fea3cc1.pdf
    • http://files.johannasipila.com/uploads/1/3/1/8/131871864/61bb0db9d66.pdf
    • http://files.themodreading.com/uploads/1/3/0/9/130969327/lepadiripigor.pdf
    • http://files.firstchristianwinchester.org/uploads/1/3/1/8/131856945/gotamovejujotetibu.pdf
    • http://files.johannasi
    • https://cdn.shopify.com/s/files/1/0432/3780/2146/files/devaboreniz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/9580148230.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/tivuxux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6960/files/9500007424.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4693/files/wunetutezomox.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/20822110849.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/37325313857.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/5972812434.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatajimawi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1265/2194/files/68988803800.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.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_off0000654e.bin
53ca176ad28fbeb3e80b40fffcaa072e96071f203ab17596d6a8c2ab4571848a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654E 4876 bytes
font_01_sfnt_off000075a4.bin
8ce775dc2b3676c9cfd6febaad88f8b753501fb0223d2ef240ce5b3181898548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A4 10108 bytes

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