Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c40275cac8628d2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-03 18:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cf5dec4be6d03665fd4e2a473da57b5 SHA-1: 5ce685cb89e4c602e10a6b9ef0bdd712b8d8f132 SHA-256: 6c40275cac8628d29fb76d969d2f5ff60a93393fc94691016875f7e452c5610b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of SEO poisoning or a link farm attack. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and embedded links strongly suggest malicious intent.

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=pictures+of+verbs+action+words+pdf
    • http://duzeku.blueboybakerywi.com/uploads/1/3/1/4/131408738/8680208.pdf
    • http://files.kgblackwell.com/uploads/1/3/1/4/131438216/4531749.pdf
    • http://files.mathewschocoruahouse.com/uploads/1/3/0/9/130969475/zonorijoz.pdf
    • http://files.houstonantioch.org/uploads/1/3/0/7/130776619/8ecf920f70a3458.pdf
    • http://files.vermontpsychoanalytic.org/uploads/1/3/1/3/131384127/423e7c9bccf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/gimasipabakifarumisit.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/79076648753.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/difosefebev.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/53297007221.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0215/files/2011_chevy_cruze_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/hornady_9th_edition_reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6234/5384/files/10262144455.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/tafebek.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/32538353410.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2240/files/nopasulubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/dufumidajutovopap.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/momavuvopogamilutatalikam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/nadobevekexofup.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_off000069e1.bin
7f03224f8ea92e30ea5201fb5744882248cdff2c4d1ff72abcfd755d72f7b166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 5412 bytes
font_01_sfnt_off00007c69.bin
81a324c3660611cd0fd0cc9689bcd6f2f2e08d2841a9e5564ba5ac30dddf6fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C69 9964 bytes

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