Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad72a45eac3d4a2…

MALICIOUS

PDF

42.2 KB Created: 2020-08-04 20:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aebcdf8c82049c3deb3a3b83552d7fb SHA-1: 5857ac0d4a927f8fd677c3f2ab14c4ef9c8773a8 SHA-256: 8ad72a45eac3d4a2bdd2c4cea1b39fd82c0f5a746ca94d58fc06ebfdd57243ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, masquerading as a free printable calendar. The primary malicious URL identified is https://ttraff.cc/pify?keyword=2020+attendance+calendar+printable+free+pdf, which likely serves as a redirector to further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports the attack pattern.

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=2020+attendance+calendar+printable+free+pdf
    • http://puvoleli.raychenclay.com/uploads/1/3/0/8/130813509/f796aab6.pdf
    • http://files.atlagit.com/uploads/1/3/1/3/131380741/7f5568d7cf88e52.pdf
    • http://files.mentes-en-transicion.com/uploads/1/3/0/7/130740177/950588450.pdf
    • http://mujopuj.burgundyproductions.com/uploads/1/3/0/7/130738666/6191085.pdf
    • http://files.riddlemusicstudio.com/uploads/1/3/0/7/130775001/1420371.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37741658126.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/physics_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/vowoxibedofox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/lupuloluxowe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/breaking_india_rajiv_malhotra.pdf
    • https://cdn.shopify.com/s/files/1/0434/3365/6476/files/jopajatemi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3058/4213/files/convert_arabic_into_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/89378565270.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/26163071784.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/gaxipab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4817/3722/files/entrepreneurship_lecture_notes_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/42333054902.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_off00006740.bin
7908a2025b258cdad0230d556655ac228e26eafcf97ac19cfbb10b2943ed502c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6740 5288 bytes
font_01_sfnt_off00007940.bin
765402cf58ba2e6cd304d94f9c7c59fc8c9dc35ec291c7e5c5f7a781d46deb6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 10080 bytes

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