Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab382d746b9ced8f…

MALICIOUS

PDF

48.7 KB Created: 2020-07-30 14:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca1f359251ea19c1a95064586a5127c SHA-1: 86ccd2b256fec63b523decb179a1a0c694ac6ed2 SHA-256: ab382d746b9ced8ff973cb9a082f4f2cf9a3c19631eef79e6fd1f2f87bc91ef6
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, which is characteristic of a PDF link farm used for SEO manipulation or to host malicious content. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled text related to academic study, likely a 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.com/pify?keyword=english+for+academic+study+reading+and+writing+pdf
    • http://files.leeishun.com/uploads/1/3/1/1/131164295/moxapavamulozi-raporaz-siberinabozale-tatosobosufel.pdf
    • http://files.honeypotcreativecafe.com/uploads/1/3/0/7/130740563/8f63578617fc.pdf
    • http://files.blissfultransition.com/uploads/1/3/1/4/131483955/5422542.pdf
    • http://files.llbrhs.com/uploads/1/3/0/7/130775260/3dd9dc9178784.pdf
    • http://files.honeypotcreativecafe.com/uploads/1/3/0/7/130
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56697352128.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/35897062971.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/wavipevopalufepolo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/laxokolegigikewosin.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/98940351137.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4696/files/duzuzodafiradevag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/bejujadodemetuwurinotevat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4863/files/23769671864.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/9516190870.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/73838640413.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/74163154124.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9992/files/33675449290.pdf
    • https://cdn.shopify.com/s/files/1/0429/3119/1975/files/befivegulo.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_off00007e53.bin
c18882b3ccccbd6973e1773e84973681aa52a1d3385203b3d9f4818741bc7723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 5604 bytes
font_01_sfnt_off00009146.bin
ef0560ceea975d4a6de4ac57b4321a1fc8576198003e228d9912cdcb55bb656c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9146 10560 bytes

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