Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c77b76ce7ede128…

MALICIOUS

PDF

51.5 KB Created: 2020-07-27 23:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b2720da3c3ba76aef58fb9263ab190 SHA-1: e0a468a61f8bb0610f16d5defdc794fd037ea1d0 SHA-256: 1c77b76ce7ede128e64da16b019b7f304db303a3e1209a9683f6d24519bd7af6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary URL, 'https://ttraff.cc/pify?keyword=d%2526+d+5th+edition+cleric+guide', is a known redirector. The document also exhibits characteristics of a link farm, with numerous links pointing to external PDFs, likely to increase search engine visibility or distribute malicious content. 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=d%2526+d+5th+edition+cleric+guide
    • http://files.plateau-valley-assembly-of-god.com/uploads/1/3/0/8/130814042/820b0530713b.pdf
    • http://files.northrec.org/uploads/1/3/0/7/130775649/xubulemasezik.pdf
    • http://files.musicalcolts.com/uploads/1/3/2/7/132712147/riduw_nezip_papusi_menimiwuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/66041333118.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/lukimogozugejaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/guwekivugosutomewafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/nodadalujisovasovuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2473/5643/files/nelarime.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2918/files/rajakavejovolugidugimiviv.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/zabemeben.pdf
    • https://cdn.shopify.com/s/files/1/0430/7825/4753/files/83969899269.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.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/
    • https://cdn.shopify.com/s/files/1/0428/5900/407

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000568d.bin
452c85ddf08a1453afbabf12492290a331ca60083693022d08cea66aed2ec9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568D 15184 bytes
font_01_sfnt_off000087e9.bin
7ae7033242d2895dfdf42de9261de94e15094fc35526834ab45b60c2f127e7f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E9 3484 bytes
font_02_sfnt_off00009355.bin
8591587baf6244a084daff82a47e1dfc36b765729799843602890481693346dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9355 14032 bytes

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