Malicious PDF — malware analysis report

Static analysis result for SHA-256 368c15e6fe8c13d1…

MALICIOUS

PDF

70.4 KB Created: 2020-08-25 01:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2218ca1b53bf0e6eb683df78132254b2 SHA-1: e3d501ecc5ed4a8924720ab2bed4b9a705173bcf SHA-256: 368c15e6fe8c13d18e16f9207c70af883af97c34562644e852d086831335e33c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but also includes a critical link to a known malicious redirector at `ttraff.ru`. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated 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.ru/pify?keyword=amerex+wheeled+fire+extinguisher+manual
    • http://jelob.effinghamelementary.org/uploads/1/3/2/6/132695839/mewuwokutiza.pdf
    • http://files.allmetalcornerguards.com/uploads/1/3/0/8/130813701/31ce6fe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3150/1720/files/blind_fury_movie_1989.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/autoalarm_cobra_instrukcja.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/40914717568.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/nrsv_bible.pdf
    • https://cdn.shopify.com/s/files/1/0437/7955/5486/files/bidezuxeviru.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/pififemesav.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/aql_sampling_plan_table.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/notting_hill_full_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/7478153299.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/43603242043.pdf
    • https://cdn.shopify.com/s/files/1/0436/4324/0606/files/caries_dental_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/king_platform_bed_woodworking_plans.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_off0000c990.bin
a056e8e5d7ebab1ecb601570a9b45e38bd5c7a96aac1b71f59142c378f91b88e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 5468 bytes
font_01_sfnt_off0000dc10.bin
cf149fb09131fc80d697243c9bbd86f40892edab784c49d684b85440434a1f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 15656 bytes