Malicious PDF — malware analysis report

Static analysis result for SHA-256 6129457bbc2ed7bb…

MALICIOUS

PDF

42.5 KB Created: 2020-09-07 06:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a210d0e6d553b44be97b935ae9ea395 SHA-1: 847d53f62480e39d9f48435ef17cc74976f2dca8 SHA-256: 6129457bbc2ed7bb27a80fd6a760ca0f3dbd7c2e161fd6ca52802863f4878727
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDF files, many of which are hosted on Shopify. The document body contains garbled text but does include the malicious redirector URL and one of the Shopify URLs.

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.link/wix?keyword=possessive+case+activities+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/3211/7147/files/out_of_the_dark_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/carl_gustav_jung_el_libro_rojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/24226829658.pdf
    • https://cdn.shopify.com/s/files/1/0465/1941/9030/files/11838612686.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6104/files/bucket_elevator_parts.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/fuel_filter_cross_reference_chart.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd84f4b3cffc464293d3979943b32196.pdf
    • https://static.usrfiles.com/ugd/cd79e3_d4833ccce23f4e2a93f1d381c755135d.pdf
    • https://static.usrfiles.com/ugd/a4e402_3c709fd47a55489d8ffcb57c0550286a.pdf
    • https://static.usrfiles.com/ugd/1c90dc_668d745aa50b4830ae3cda9de5e5535a.pdf
    • https://static.usrfiles.com/ugd/ade4e6_03b23d6ab2b0483da7962e45aadc2134.pdf
    • https://static.usrfiles.com/ugd/87fdc7_5cf5361467884edd863ab9f978e1971a.pdf
    • https://static.usrfiles.com/ugd/5bf82b_f945988f14984d81855c44a50e40a074.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_b4ede163c0a6400ba97963210f0cc867.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ac9f9b88e3c48abafbd446574e31abb.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000695d.bin
1ceaa84271cb33126d477eec0334231e6f192583134138b830d83902da876cf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x695D 5080 bytes
font_01_sfnt_off00007acc.bin
6607649440c2ce285778b6d22727b7e921f6ac3c8bb46cd4aed26cd76721b774
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACC 10076 bytes