Malicious PDF — malware analysis report

Static analysis result for SHA-256 829c21499448e98b…

MALICIOUS

PDF

52.0 KB Created: 2020-07-28 17:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 504684bbc4c972dd2b1c9a47f700c6a5 SHA-1: 1ad1091664c7091033b3f4bd73b7c686a1e10147 SHA-256: 829c21499448e98bd78a04a49c674564523259c6b1996bc7afc22179df2e4fe7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary redirector URL, 'https://ttraff.cc/pify?keyword=100+cotton+double+bed+sheets+online+shopping', suggests a lure related to online shopping, likely to direct users to malicious or spam content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate malicious intent, possibly involving JavaScript execution within the PDF to facilitate the redirects.

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=100+cotton+double+bed+sheets+online+shopping
    • http://files.surfcoastsecondarycollege.vic.edu.au/uploads/1/3/1/6/131637953/2766119.pdf
    • http://files.millomrufc.com/uploads/1/3/1/1/131163846/fadetinu-rituxutapedo.pdf
    • http://files.iwstreecare.com/uploads/1/3/2/7/132740479/wogupu-zukokitoruwogog-zikezugufada-pubuzesilas.pdf
    • http://files.kilkennyarchclub.com/uploads/1/3/2/6/132681823/e8eccbd6c7e29f.pdf
    • http://files.simplyinspiredrentals.ca/uploads/1/3/1/8/131856326/xerutejuzi_wovufakefakur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/xanofesek.pdf
    • https://cdn.shopify.com/s/files/1/0433/6143/5813/files/davum.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/12548782380.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/wibomazipurifapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5808/files/tavikak.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/xigexolovegomivapomej.pdf
    • https://cdn.shopify.com/s/files/1/0434/5269/4680/files/363109799.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/69241029407.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/83189795125.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/nidoterutotodesufidumuli.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_off00008d4c.bin
a88f2c0c38812b93f4e95f7a989f47423af84ce7645ac674838748bdc56e6267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4C 5152 bytes
font_01_sfnt_off00009ebd.bin
8ed0394ed1834f755b182e1e4386f82767338aabfba6e9f080f06552850d4a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBD 10504 bytes

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