Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaa13c3650da1d6…

MALICIOUS

PDF

81.1 KB Created: 2020-08-30 05:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 032bb989cfcfbdefae77c550d4c4cad5 SHA-1: 40a473a1c07fce7f8c1ee4aa4d3f3ad11e641b66 SHA-256: bcaa13c3650da1d683157f921679ea41599598a734594e1ee31d40f138e9d0d7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that promises a free album download. This URL is embedded within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on cdn.shopify.com, likely for SEO manipulation to increase visibility of the malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=good+kid+maad+city+free+album+downlo
    • https://cdn.shopify.com/s/files/1/0434/8398/8125/files/work_afrobeat_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/5435512172.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/83367014795.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/22630493952.pdf
    • https://cdn.shopify.com/s/files/1/0439/8389/6734/files/37665312802.pdf
    • https://cdn.shopify.com/s/files/1/0432/5828/2152/files/nurani_al_quran_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3100/1250/files/food_safety_and_hygiene_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0461/9400/0023/files/teh_bunga_telang.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/lpg_bottling_plant_project_report.pdf
    • https://static.usrfiles.com/ugd/73cb9e_c03b012ed7fc4ecb951f38a9b76bfaa3.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_bfd315ee576f4087a079f43c8b522e45.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_5ecbbd3dc824442e8b84300f31545678.pdf
    • https://static.usrfiles.com/ugd/b8c837_84925f555f054e87bcf7bacf60537fb1.pdf
    • https://static.usrfiles.com/ugd/353d00_71a20986e7bd4b26817e69fee2eb0396.pdf
    • https://static.usrfiles.com/ugd/2f8cea_41709fdcd1244fedb2f785d5160fc319.pdf
    • https://static.usrfiles.com/ugd/d775a9_62f051026608456ca206779ca033d586.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abcaceee78f4e7dbff6621253b4b752.pdf
    • https://static.usrfiles.com/ugd/8cbfce_3709fec8db43498c9be073e503dbbf58.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_off0000f264.bin
e0138af7fe168a4b67f1d098731d923d73a7bfe6297562bcbdc173d2f7ca14c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 5416 bytes
font_01_sfnt_off000104dd.bin
f9e2a5a7584a49e3ffc4a08bf8c54372988424c627bfa7d92018022e37334d38
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 15996 bytes