Malicious PDF — malware analysis report

Static analysis result for SHA-256 898594abc0411b76…

MALICIOUS

PDF

53.4 KB Created: 2020-08-05 18:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b88b857f717081c1cabfad3b9fb75a SHA-1: f01b762889c009518b295bd087a435476823e935 SHA-256: 898594abc0411b761a17844274a22b82be3b1f145b21ed0cbe0244aa2298cb53
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains numerous links to external PDFs, suggesting a link farm for SEO manipulation or to host further malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. The primary IOC is the redirector URL, which is likely used to host a second-stage payload or phishing page.

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=application+form+for+govt+job+pdf
    • http://nepij.zanmatthies.com/uploads/1/3/1/6/131606069/wapalegelovokiludadi.pdf
    • http://deruxedik.tamueventing.com/uploads/1/3/0/7/130740069/dadf7079b48b1a.pdf
    • http://files.adventureacademyinc.com/uploads/1/3/1/3/131379709/xexijupojo_dejonojifa_wemusoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/4774/6716/files/51203597234.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/49998043191.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/fast_matrix_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/bupixiretijug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0545/2193/files/sowobusamifekelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/40173885317.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/4366656925.pdf
    • https://cdn.shopify.com/s/files/1/0447/8582/7991/files/aspect_score_stroke.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/39719333134.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/11714853984.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lagikemirulufuwetore.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/54410647445.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/39781921225.pdf
    • https://cdn.shopify.com/s/files/1/0435/6040/3103/files/tinotewazuvadan.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_off00007bc1.bin
0f6665df4b803fe4eef7ff5351423bda3192a4764261f064c917957cbe834cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC1 5564 bytes
font_01_sfnt_off00008ea6.bin
7d46333eb1a3ad68e659e655527af911b5c4271636eb448fda3fbb18203ed3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA6 14656 bytes
font_02_sfnt_off0000bc31.bin
fc51a2a746ba286959ad309c7e3e5b38b844e62a0da8849e910a7ebb366547b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 2964 bytes

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