Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fa4e98d869a25b…

MALICIOUS

PDF

61.1 KB Created: 2020-08-16 22:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae44053a5d1c31e84c75273d8ff2ec7 SHA-1: 03f09047fadb2cf4ece3e6a0d2a80492f6a02eeb SHA-256: c9fa4e98d869a25b7678f275281badde651a459528723b2fbc06fa753a93de41
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an academic syllabus. This link leads to a farm of other PDF links, likely to obscure the malicious destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link-farming and redirection attack. No scripts were extracted, limiting the analysis of direct payload delivery.

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=pci+syllabus+b.+pharm+2017+pdf
    • http://files.idaspence.org/uploads/1/3/1/4/131406885/6265964.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/biology_education_project.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/google_chinese_fonts_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/capteur_de_pression_d_huile_moteur.pdf
    • https://cdn.shopify.com/s/files/1/0449/9665/7320/files/rexuragesifafex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/tukuwulosunijisubafibi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8081/8581/files/landmark_experiments_in_molecular_biology.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0177/files/pravastatin_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/mitizewulipozafivij.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/makemudaxufuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/jurnal_abortus_spontan.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/differentiability_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/67715277791.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/assinatura_digital_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/73607345958.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_off00009669.bin
140344c5d8841d3fed72ef1412696d8e4084ffbbaca3879f6aa95b75e054d2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9669 5544 bytes
font_01_sfnt_off0000a938.bin
27be85efe046a186b3e32394ac5b401d16fc95aa8fd28adb76222b0138bab334		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA938 15412 bytes
font_02_sfnt_off0000d9a7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 4324 bytes

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