Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2adcbe10ad133ee…

MALICIOUS

PDF

48.9 KB Created: 2020-07-30 15:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22cd824e10bb45c40378ea75c95eeb1a SHA-1: 40f9dae662be5a604bca5d11a4d5e1ace3b1ec96 SHA-256: c2adcbe10ad133eea358d93c7ed7e52f18b4b9af335acdb14d086404d423cbaf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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=air+force+previous+paper+pdf
    • http://files.loukobin.com/uploads/1/3/1/8/131856176/zozaxijawoz.pdf
    • http://files.5ivecoffee.com/uploads/1/3/0/8/130873807/kupotunufe.pdf
    • http://files.shop.dannysrods.com/uploads/1/3/1/4/131453577/xevepifezoz.pdf
    • http://files.crusadecavalryreenactment.com/uploads/1/3/0/9/130969414/sasowi.pdf
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/jurivelonokil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/70042570337.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9522/files/zobulagodat.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/goged.pdf
    • https://cdn.shopify.com/s/files/1/0433/5989/5717/files/29104269307.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1272/files/petabukubikipur.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5521/files/jifiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/mejovuzojidadibofala.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/56931686336.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/16907608215.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/bojemofojowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/kokejipabikorevepavubiboz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/19635310842.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007591.bin
a8f4467266a7a2ba8c500c5dd0d91bdccd0332c8433115a244aeb8acc9416881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7591 4860 bytes
font_01_sfnt_off00008628.bin
bf4025f421430ec1557961101af80a3de87309146d1780b0b22ceba0bd16b885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8628 10112 bytes
font_02_sfnt_off0000a8df.bin
d7a1248cabf161ff78a072bd924b98f1b4e551660f4e151c9433689786990c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8DF 2832 bytes

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