Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a2b88eee0c9052…

MALICIOUS

PDF

39.4 KB Created: 2020-09-17 04:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d09d3918df1bb9cd53ac2bcd8d592e7 SHA-1: a3e068de17192bdde5beabbfa575fd8ce5577a3b SHA-256: 77a2b88eee0c905236d5743d6b6cf53e3de4c158b8e4dd3848c5176de3ec29b8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.link'. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious links. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect the user to a malicious site.

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.link/wix?keyword=hamlet+study+guide+grade+12
    • http://fafoledug.charlesmconard.com/uploads/1/3/1/6/131637056/sipebasuzagegokikegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/67692594745.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/accounting_information_system_multiple_choice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9644/8917/files/puvixak.pdf
    • https://627b9128-a363-4b5b-a199-445c5035ceec.filesusr.com/ugd/4a2613_cf17a4f653a2449dbaf6fbf597199d52.pdf?index=true
    • https://48aa0e67-875d-4a9f-adb7-5e5985182135.filesusr.com/ugd/724fb5_b7e1c50388f94e94a2bb199f5b1ac604.pdf?index=true
    • https://bc2f5dc2-3952-4a55-82a7-12bb7b594127.filesusr.com/ugd/1a1092_909c142eb91948fa909fc33a1fa28f5c.pdf?index=true
    • https://709e5b45-1594-4ed3-b68b-b1886209f51d.filesusr.com/ugd/3be48b_708e058c02f54cf5922a5d1de5998ce8.pdf?index=true
    • https://0c2f64a4-c967-4ca3-9c7a-b77b43c05d2d.filesusr.com/ugd/b85eb0_b42a5af1a1894d139465c8dc64cd50df.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/7286/3899/files/teleflex_marine_tachometer_settings.pdf
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/14119783898.pdf
    • https://cdn.shopify.com/s/files/1/0434/5007/3240/files/ditatomolebapedakid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b70.bin
36d7f4b8749cccc8d99439c86641d178a1aa88cc71cce6a8be3989942fd79c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B70 5392 bytes
font_01_sfnt_off00006db9.bin
da39f4addae98b45295965d810467ab2914736e9a237a302401f9399941a8b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB9 10284 bytes

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