Malicious PDF — malware analysis report

Static analysis result for SHA-256 0184ed7b77ab02a8…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 16:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e18f385138b2490160cdee988987def SHA-1: fd0d73b1fc4e8f3bf0d5d55b0494adffaa750f45 SHA-256: 0184ed7b77ab02a800753e4fe4136e01849e324799451ea9e14d183c0d795b50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.cc/pify?keyword=lateral+epicondylitis+pdf+exercises', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled but contains the redirector URL, suggesting the PDF's purpose is to drive traffic to malicious sites.

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=lateral+epicondylitis+pdf+exercises
    • http://lulabu.critical-juncture.net/uploads/1/3/0/7/130775918/18d5030a7.pdf
    • http://files.kingfisherpbs.org/uploads/1/3/1/0/131070149/5932025.pdf
    • http://bobeputi.davideweed.com/uploads/1/3/1/6/131636612/gerab.pdf
    • http://files.chisholmtrailexpo.com/uploads/1/3/1/3/131379268/e6c520f278c50.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/canon_mp250_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/1695590025.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/marulenomipojofugalereve.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3921/files/70913977337.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/pubulojosuxuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/temp_email_address.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/81415150936.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/10788163106.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/nomalura.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/84417331796.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/15832502850.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.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_off000061ab.bin
d5814d91de615e3314d73cd22f7331de38f1f5717870e0cb29979e7fbe235b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AB 5260 bytes
font_01_sfnt_off000073ad.bin
3bc4dc1609b3ca4fb966026cd0edc2a662e67105de4fe635f88a77c3c8589916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 10588 bytes

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