Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc80465878222f9…

MALICIOUS

PDF

44.4 KB Created: 2020-08-07 06:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f85027491ee22528aef5523d7287e12 SHA-1: a368851fb868213a0e458e389dd99c72568a2cd9 SHA-256: 7bc80465878222f91eecab0c3d36c128fb134a43dd78d58970e4ec7207a0ebce
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to 'Developmental biology 11th edition pdf' and the malicious URL https://ttraff.cc/pify?keyword=developmental+biology+11th+edition+pdf, suggesting a lure to download a fake textbook. This URL is identified as a malicious redirector, and the PDF also hosts a large number of other links, many pointing to benign Shopify domains, but some to unknown domains, forming a link farm. The ML classifier also strongly flagged this PDF as malicious.

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=developmental+biology+11th+edition+pdf
    • http://files.sunbeamfamilyyoga.com/uploads/1/3/1/3/131398380/a2f29602d2.pdf
    • http://files.idzea.com/uploads/1/3/1/3/131379801/4547718.pdf
    • http://files.bridportfolkfestival.com/uploads/1/3/0/7/130739789/b57efae5b22.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/sagafawegoferivekadezuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/wiwubefadowekegomewobonuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/12796113173.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/222223695.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/29036234490.pdf
    • https://cdn.shopify.com/s/files/1/0433/6723/5742/files/67943174005.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3237/files/jupobemevizunike.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/93763697106.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/namavoludanejafuxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5548/7905/files/14946320928.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/47692460.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/77867721802.pdf
    • https://cdn.shopify.com/s/files/1/0451/2507/5109/files/astronomical_almanac_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/nelarajolugivusavenikesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/linux_move_file.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_off00005fad.bin
7139618588f64fad4834f6841028edfe2e0e0206a711a1c34798e58a0a344807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 5324 bytes
font_01_sfnt_off000071ae.bin
b4c7dd1d92544ebac53924b10f33ac1d0d7a7816714508580d1d89da08f3aa99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AE 10728 bytes
font_02_sfnt_off0000965e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965E 4324 bytes

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