Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaef907045641ce…

MALICIOUS

PDF

43.9 KB Created: 2020-09-05 03:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26ce61ae4fe95ad478efd676bb9486ab SHA-1: f3d8a0e802463c407eefcdab36ec5e292ef1c39d SHA-256: fbaef907045641ceba6f1f85e1f87c204d8b6721ef78ad07b23eb23e55a8b3db
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to benign content, but one critical link redirects to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves a lure to click a link, which then leads to malicious content, likely for further exploitation or credential harvesting.

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.me/wix?keyword=interior+design+detail+drawings+pdf
    • https://static.usrfiles.com/ugd/a2e20a_9227f4084d67441ea70592238293ac12.pdf
    • https://static.usrfiles.com/ugd/2b25b5_ecb878f6edb1425680ff7e7904c75457.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ab13af961bc4280b78ae6cec885a270.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/foruxinizogibuzidetuba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/broken_silence_natasha_preston.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/99083489471.pdf
    • https://cdn.shopify.com/s/files/1/0439/6898/7294/files/liberty_mutual_workers_compensation_claim_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/femolim.pdf
    • https://static.usrfiles.com/ugd/ad8f3a_324091b8906f45dcb4d4c177076f6a2f.pdf
    • https://static.usrfiles.com/ugd/800b88_ee76454846d54d2c99ade3d499029c56.pdf
    • https://static.usrfiles.com/ugd/9ef0c3_bd39b799764644ffb8179be3f560afa4.pdf
    • https://static.usrfiles.com/ugd/2a1429_492448bcb16f4e26a7dcd398e0a8f4dc.pdf
    • https://cdn.shopify.com/s/files/1/0457/3403/5622/files/xuwufu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/33884239010.pdf
    • https://cdn.shopify.com/s/files/1/0462/6717/0970/files/android_save_bitmap_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0457/5526/9276/files/51676590635.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_off00006d7b.bin
bbefeb8ab60fdab1449bb51851a79e73cae6a6d2c4efda4fe4dd6a15c674155d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7B 5236 bytes
font_01_sfnt_off00007f6c.bin
9a43d83ab2e4c93c8ffcd7687b85d35ebe1ad904749f336bca05fa6d33ad1282
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6C 10288 bytes