Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc97b842c359b87…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 13:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e860be19c039f6da9a0bdf5be3b6c15 SHA-1: 157f27b0815a4f6f721f2521f5adbc09b8bf0556 SHA-256: 7dc97b842c359b87aa800281586ddaa65fa84ae0c2d2b40ac98e996fd262642c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL identified is https://ttraff.cc/pify?keyword=brownian+motion+and+stochastic+calculus+pdf, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a SEO poisoning or link farm attack.

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=brownian+motion+and+stochastic+calculus+pdf
    • http://files.robwms.com/uploads/1/3/1/3/131380008/rabito-zageguwiw.pdf
    • http://files.tackandhorseoman.com/uploads/1/3/1/4/131407737/00e48a.pdf
    • http://files.psusdarts.org/uploads/1/3/2/6/132696512/gopimavex.pdf
    • http://bagim.salmanhashmi.com/uploads/1/3/0/8/130814328/xujegufelit_gisawamad_xijedamazo_dofofi.pdf
    • http://files.la-arts-district.com/uploads/1/3/0/9/130969471/936724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/87461928403.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/nibaverizesurosewised.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/bayesian_inference_and_decision_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/88478406067.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/beled.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/24056124251.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/8222050036.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5193/files/wheelhouse_5550_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0863/7602/files/best_psp_themes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0807/files/73811168632.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9856/files/circus_circus_musgrave_menu.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_off00005d84.bin
5564d9290d6d325b9dffe38c55b74afe978f6322763b6989e5360a88af6d655a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 5300 bytes
font_01_sfnt_off00006f68.bin
1f43aed573f9727801f4205d49a8cc2d03959440a53e287e85434c89901ea50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F68 9948 bytes
font_02_sfnt_off00009184.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 4324 bytes

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