Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b038b668bd67f0…

MALICIOUS

PDF

38.9 KB Created: 2020-09-22 06:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bd024a75c78952c04d008e25eb49493 SHA-1: 0978fb925efe18b39ef3d4d79b5f5ef8eec9156a SHA-256: 85b038b668bd67f0924516b23a4c857b3738c28936f0275f4d5fa66153fd1b5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=stickman+hero+2+mod'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious. The presence of these elements suggests the document's primary purpose is to redirect users to potentially harmful sites, likely for phishing or malware distribution.

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.club/wix?keyword=stickman+hero+2+mod
    • http://ritusigid.runninonfaithtc.org/uploads/1/3/0/7/130775358/7634734.pdf
    • http://foxubema.metrotreeandcrane.com/uploads/1/3/1/0/131069839/siven-molewowilurugej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99d66d5b-c3d3-4c42-a416-0a46ef79c14d.filesusr.com/ugd/0010c8_7b6b81f3bf5346c78cbea5d8803386be.pdf?index=true
    • https://3cfb8d49-77ed-4156-8156-2315f47e8d2d.filesusr.com/ugd/3d7af5_4b366c80e1cf480da1e15f7d3e15e74b.pdf?index=true
    • https://791399e7-31ef-43bc-9473-6eb75898c7c3.filesusr.com/ugd/e7e4a0_09ec224d0ae149f28a27d531b5dd8128.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/71210466410.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/46745351397.pdf
    • https://cdn.shopify.com/s/files/1/0436/5094/1078/files/graph_paper_multiplication_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/4282/4611/files/aneurisma_fusiforme_cerebral_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/egan_library_hours.pdf
    • https://a69c960a-ead5-467a-b5cb-7273e6dd946b.filesusr.com/ugd/2ca09c_49d9a7024d5f4c91b288ef569dfb4f7b.pdf?index=true
    • https://2c054c0a-54ba-4e53-a0a2-eae6a5a6a60c.filesusr.com/ugd/430cb2_95689d0437bf41f3aa83261eb728bf84.pdf?index=true
    • https://fc42af31-7e21-4fc4-90b8-303c3d270f51.filesusr.com/ugd/1a94e8_050b469898954545b8f90a7f933754e2.pdf?index=true
    • 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_off00005928.bin
24e2e66e1efc3d0f786669e4854cedd20266a1e65d353e3311832c2e6136c927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5928 5268 bytes
font_01_sfnt_off00006aea.bin
22521887d20a01d67e35ce96916bbc9d4867e1e10018ac3f44316f5d4b5f362c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEA 10500 bytes

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