Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb818954c12b080…

MALICIOUS

PDF

42.3 KB Created: 2020-08-04 07:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0dab460b4b2156e88b74c0f314785f SHA-1: db7832767a5491cb44aac41c148a9ebbda0031cc SHA-256: 9cb818954c12b080819ae718f2133088270a24a9aada4e30bd102308c99ab882
154 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 for a malicious redirector. The document body and embedded URLs suggest a lure for free PDF downloads, which ultimately leads to the malicious redirector at ttraff.com. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector is the malicious redirection.

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.com/pify?keyword=english+translation+book+pdf+download
    • http://files.ashleynwatson.com/uploads/1/3/0/7/130738712/796ddb3f.pdf
    • http://files.nemescreative.com/uploads/1/3/0/7/130776823/zavibekufojerekitus.pdf
    • http://files.delandhsband.com/uploads/1/3/1/3/131379700/5821082.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/rorezufinekoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/free_xxx_incest_cartoon_pics.pdf
    • https://cdn.shopify.com/s/files/1/0438/3339/3309/files/22222695046.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/site_analysis_architecture_presentation_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/22750272474.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/3434293011.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/60931945652.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/78457588684.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/809019356.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2503/files/lowob.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_off000066e4.bin
2422a47b092d4c0aaa54b746b369423baa97a734a3af4415bc83fd20621ee52d
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E4 5556 bytes
font_01_sfnt_off000079d5.bin
6d86bb4ba3912da86211e18e093fa5295eaf74070a10a28d4a4bc933e4ae8412
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D5 10192 bytes