Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8e2d8a81a2c4fe…

MALICIOUS

PDF

57.2 KB Created: 2020-08-08 06:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60fdbb3353b8f5aca492270a9671c067 SHA-1: a107733927b5de5acfb1c24ff88f3daf2a120c51 SHA-256: 6a8e2d8a81a2c4fe0514d21908c7e2584cf2879ce19805c1a3465770d32c0422
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though partially garbled, includes the malicious URL and keywords related to medical treatment, likely as a lure. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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.ru/pify?keyword=spontaneous+bacterial+peritonitis+treatment+pdf
    • http://files.jeffersonfryco.com/uploads/1/3/1/4/131452750/ginuxatoxowamo.pdf
    • http://files.inspectordeanjones.com/uploads/1/3/2/6/132681409/4555756.pdf
    • http://files.photographybysergina.com/uploads/1/3/1/4/131483138/9dfb214b5e3.pdf
    • http://files.sincerelythecraft.com/uploads/1/3/2/6/132696512/vubukekapebi_mugafepos.pdf
    • http://files.frugallery.com/uploads/1/3/1/4/131454521/libokapibik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/do_not_dumb_here.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/facebook_networking_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/25434585557.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/31141217372.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/gta_5ps3_mods.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/bifudexemaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4817/3722/files/65018108884.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/27411579828.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/77134535914.pdf
    • https://cdn.shopify.com/s/files/1/0433/4570/7166/files/gelakawufikegizev.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/customer_centric_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/47149476397.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/33359452495.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/gibifudaburefexu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/advanced_vocabulary_words_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092af.bin
d93d04fd12f4f68f328293a4a9ee349fe6a54b9d95f1f8d179744629a2b0db4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AF 5424 bytes
font_01_sfnt_off0000a4f5.bin
b02cb78e45bee0345a3192dc2d1e2777625a83c9fc10c555555c00b40b2b420f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F5 10500 bytes
font_02_sfnt_off0000c8dc.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 4324 bytes

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