Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f51db0ce9e77b9…

MALICIOUS

PDF

48.9 KB Created: 2020-09-02 02:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f8594aaba7d4477aa8c67882de7cce SHA-1: efdb389a2b53a81a3eeb3d4681b054174efed3f4 SHA-256: a5f51db0ce9e77b9fdc9fd91d53e6d4b7b41d78fae91054d7a792250f8a092a0
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=baaghi+movie++2016+hd'. This link is likely used to redirect the user to a malicious website for phishing or malware delivery. The document also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=baaghi+movie++2016+hd
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/20837790770.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/givolodawadepogujavo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/32649261544.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/medususebititodix.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/66401830529.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/22249021113.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a144960a525420684dbeacbb8ec8792.pdf
    • https://static.usrfiles.com/ugd/b8c837_71baf34b07de4a609da323efc26e6da5.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_b815dad38c3d46f4b61dc3cf61530e42.pdf
    • https://static.usrfiles.com/ugd/275374_7edeca203f234a3c8d0822c6b0f092a1.pdf
    • https://static.usrfiles.com/ugd/1b8612_8c444bbb4bb246aca4b47e2ee1efa298.pdf
    • https://static.usrfiles.com/ugd/3649d2_fbe259997350458fbaf0570c0b433284.pdf
    • https://static.usrfiles.com/ugd/de3d83_ae1c01636cb14d4c87be6e2f1be3110b.pdf
    • https://static.usrfiles.com/ugd/76156b_b24ce634d72f4d0a86d1791cae0e36cc.pdf
    • https://static.usrfiles.com/ugd/7dfe85_80487aac5c854ea1a5d6cb60b2d414fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfea0c76f4e54f80a218fa9ceca37549.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_off0000699c.bin
d4d61592290a5bcd7ecc12145096127a51d2143bda8786ccc9650f7298ef241e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699C 5524 bytes
font_01_sfnt_off00007c54.bin
d3fd987ace3f5233187b0da3b67c7d9ae4686f293c34049677b747101c3a65ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C54 10728 bytes
font_02_sfnt_off0000a13d.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13D 16164 bytes

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