Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c871b8f7a8e5cab…

MALICIOUS

PDF

39.8 KB Created: 2020-08-15 05:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e4d39d56463c849fa279a196a3084ce SHA-1: 72b484bf4371b475082a55aa239a7817b0dd02a9 SHA-256: 1c871b8f7a8e5cab6e183023d7ee9f196706810c25677775968af4135f0fdc2e
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning or redirecting users to malicious sites. One such link, 'https://ttraff.ru/wb?keyword=tree%20data%20structure%20tutorialspoint%20pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to this malicious infrastructure. The presence of multiple Shopify-hosted PDF links further supports the SEO link farm heuristic.

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.ru/wb?keyword=tree%20data%20structure%20tutorialspoint%20pdf
    • http://files.loyaltybeyondborders.org/uploads/1/3/2/7/132712127/dowafelo.pdf
    • http://files.modernbusinesstech.com/uploads/1/3/2/8/132814567/navuv.pdf
    • http://pupap.homepick.us/uploads/1/3/1/0/131070872/1419695.pdf
    • http://files.balanceandneurologic.com/uploads/1/3/2/6/132696465/sunujadojuwo_xivux.pdf
    • http://siwesatip.totalbodyfitnessnj.com/uploads/1/3/0/8/130874163/jafesage.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2791/files/xikazikusotesoburewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3088/9126/files/75345765335.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/xugevoxumoremalonije.pdf
    • https://cdn.shopify.com/s/files/1/0431/7088/9892/files/bedajam.pdf
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/35185805299.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/vexatiwiku.pdf
    • https://cdn.shopify.com/s/files/1/0441/1860/5976/files/android_sdk_manager_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/paris_metro_map_with_streets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/bootstrap_4_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/fiwarubalewebifode.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/wukomepoxufudizipu.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_off00005e5e.bin
bb1a0a44d19d907daeb36b971c718b6282ae28ba404da4f39712a66b2f3436e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5E 5100 bytes
font_01_sfnt_off00006fbb.bin
3c131ec0d2a0cf839b6537896cfde1b69a4d1e16a363f7f82d48d70e0a5283d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 10104 bytes