Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f5f0f78d501e3c…

MALICIOUS

PDF

50.5 KB Created: 2020-08-14 02:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3740c8cde1081c1b812a97c39c3f63e7 SHA-1: d7f8c1ebf555435071f4a837d52d81f983fb43cb SHA-256: d6f5f0f78d501e3c8f8502d5ed9905f00b7dd667747e4b0fb18b27abebe86220
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a game download. The document also contains a large number of embedded links to Shopify-hosted PDFs, suggesting a link farm for SEO poisoning or to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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=4x4+off+road+drive+game
    • http://luxonojuj.kidscuriositylab.com/uploads/1/3/1/6/131606146/106204f.pdf
    • http://tedop.trails-and-errors.org/uploads/1/3/1/4/131453459/6385932af798d0.pdf
    • http://files.hayeon.studio/uploads/1/3/2/7/132712325/a1f8c3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/sebunojalumeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/spivak_calculus_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2702/8375/files/mojidokoted.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3388/files/33716249936.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/40963783381.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/romisuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/10730442389.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/gasupatimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8879/0179/files/6228698727.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/34058951796.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
stream_005_off00009849.bin
872fb455cdcc94281cb2a38cd8fdee696be1bf7d262f1d44466725fb9eb1d1d9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9849 21244 bytes
font_00_sfnt_off00005dc4.bin
a28181f2b6c729ad7c7ef99ed6ff43414130d2bbb2b6f4f7dee3b162b10fc677
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC4 5140 bytes
font_01_sfnt_off00006f3c.bin
24eae2c38263dee2cbfd9e794ca9e3915f93d3d300219faccb1f0883b8efb024
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3C 12936 bytes