Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce699cbaed71671…

MALICIOUS

PDF

38.8 KB Created: 2020-08-17 15:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3207dcedf0fa564332113168180d44d6 SHA-1: b6963d5730f194290555ee3106fd124fd82241c3 SHA-256: 8ce699cbaed7167138b431f6e42b65767f116068898d0383e83a2bf0b2cfe8f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify. The document body appears to be corrupted or obfuscated, but the presence of numerous links suggests a delivery mechanism for further malicious content. The ML classifier strongly supports the malicious verdict.

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=high+strung+violin+sheet+music
    • http://gevuvelu.etwritershof.org/uploads/1/3/1/8/131856772/e6f96eba.pdf
    • http://files.mindfulhoney.com/uploads/1/3/1/1/131164558/bimupipigijikabeso.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/gilapozuda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93366398369.pdf
    • https://cdn.shopify.com/s/files/1/0454/6691/0872/files/bsc_mlt_syllabus_ptu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9393/4748/files/rationalism_in_politics_michael_oakeshott.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/august_blank_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/thesis_title_in_mathematics_education_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/certificate_of_origin_template_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/2874/2298/files/effective_academic_writing_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8203/files/apartment_rental_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/solving_equations_practice.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7191/files/short_riddles_and_jokes_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3109/files/mastering_blockchain_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/95461645941.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000594b.bin
a2dab1ae1716162c80c55dad2d05101ca2063d2efcbbeffd9e015635a8d23941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594B 5024 bytes
font_01_sfnt_off00006a43.bin
02dfb3a423bc463d5bce0cb44f28f2a47c9b96c33f3fa56f80ec8a5d42fe99f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A43 10576 bytes

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