Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed906408a398b2b…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 02:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71700c30fa24ca613ad65e920a0075f8 SHA-1: d978f9c586843ce8a0b0047c1b56c2dc90b9dfca SHA-256: 4ed906408a398b2b4168a089ba65c016716744e8462e4d17e4361c7fa828c756
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=medical+virology+mcqs+with+answers'. This indicates a phishing or social engineering attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains this same URL, reinforcing the malicious intent. The presence of a PDF link farm heuristic further suggests this document is part of a larger effort to distribute malicious links.

Heuristics 3

  • 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.
  • 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=medical+virology+mcqs+with+answers
    • http://fejufija.nysmathregentsprep.com/uploads/1/3/1/4/131482975/zobibe_fezerek.pdf
    • http://files.fwdskillzone.com/uploads/1/3/1/4/131453907/48ba82f20513.pdf
    • http://files.firstpeoplesfirst.org/uploads/1/3/1/4/131437873/9157595.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/69829794761.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/plant_and_animal_cell_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/filenugivox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/tecnicas_de_aprendizaje_activo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/21140088761.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/catalyst_athletics_standard_warm_up.pdf
    • https://cdn.shopify.com/s/files/1/0438/7602/4475/files/9756036246.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/11392306224.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/79504363080.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_off00005b16.bin
7f57fffbeac32a5cd203254fa9aa29a29ff1030cb38666f0287876d72697f339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B16 5736 bytes
font_01_sfnt_off00006e8a.bin
4c448727133d5bac493688310d38236ef86e4a9c52308f503db6e0ba79457689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8A 10012 bytes

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