Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a677657dbed3670…

MALICIOUS

PDF

50.3 KB Created: 2020-08-26 04:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f98f7d8fd2570ee894c3d45b2716d52 SHA-1: 827f12c4b372afcc2c6337d1b035934136a3b1f2 SHA-256: 4a677657dbed3670e19e81d6bcb009eb2d95f5710cf965f50c5f6e40b766704d
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links pointing to external PDFs, characteristic of a link farm. One of these links, 'https://ttraff.ru/pify?keyword=unitel+angola+annual+report', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, further supporting a malicious intent, likely to lure users to malicious 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=unitel+angola+annual+report
    • http://tuzonedu.midnightbordercollies.com/uploads/1/3/0/9/130969959/saponoju.pdf
    • http://dowasime.ccpdiscoveryschool.com/uploads/1/3/1/6/131606490/fedawosorolib.pdf
    • http://files.kriyastrology.com/uploads/1/3/1/8/131857679/senovu-nopilegadutedi-vatenedufasuxul-naxivufepoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0342/files/adjectives_lesson_plan_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/anatomie_systme_respiratoire.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/viwamewawotuvibevirofidet.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/rululipapilitagil.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/types_of_behavioural_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/13171416299.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/open_court_resourses.pdf
    • https://cdn.shopify.com/s/files/1/0452/3107/9584/files/vumewodovorarelalesok.pdf
    • https://cdn.shopify.com/s/files/1/0440/5441/3462/files/ajay_kumar_singh_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/6612/1623/files/11077229847.pdf
    • https://cdn.shopify.com/s/files/1/0459/9794/9087/files/farewell_to_arms_study_guide.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000732d.bin
dc8a3cdb7184401337532209aca7240e487820cd1cae78741fb1e29937c3793b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732D 4684 bytes
font_01_sfnt_off00008320.bin
21962d3784dc1e61c5196ac6bc85386f24956d6a5ed26450b643d655c16c4368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8320 13020 bytes
font_02_sfnt_off0000ac5f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5F 4324 bytes

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