Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9d732ca8d6fe55…

MALICIOUS

PDF

59.0 KB Created: 2020-08-13 16:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6ce209aee4908908504dc71f4c8f1aa SHA-1: d9763659c8585c6a59d1809aacdf244b0b73200d SHA-256: 1c9d732ca8d6fe55f1eb5d9d8a0abc244daa6d9edde1b350a2d268e2f4815a1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=wooden%20box%20bed%20design%20catalogue%20pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=wooden%20box%20bed%20design%20catalogue%20pdf
    • http://files.sustainablesecrets.com/uploads/1/3/1/4/131483138/muxulemezeg_fejirav_gijala.pdf
    • http://files.newadventuresamejourney.com/uploads/1/3/0/7/130775223/5470546.pdf
    • http://lavuw.vanessanbrown.com/uploads/1/3/0/8/130814328/fudufazuvedusifuroju.pdf
    • https://cdn.shopify.com/s/files/1/0438/0576/9888/files/gubezujawekomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/walaxarovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0855/6182/files/guvama.pdf
    • https://cdn.shopify.com/s/files/1/0431/0620/5857/files/st_caste_list_in_ap.pdf
    • https://cdn.shopify.com/s/files/1/0438/9984/6824/files/op_amp_differentiator.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/kubukamame.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/36044348240.pdf
    • https://cdn.shopify.com/s/files/1/0432/7296/2203/files/fodijobizusimuxarefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/wedovawelokigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8048/files/31726720161.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/capacity_planning_nptel.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_off0000a800.bin
c366dd3805e02c81a823cec45c835c7a3aeb8d0e441b60dc2e06a1bec193e251
pdf-font-stream PDF embedded font (sfnt) at offset 0xA800 5448 bytes
font_01_sfnt_off0000baae.bin
50d0662c6380a41ed8b993b4e64030f7d04786b4223586e9cbcb6eb172034b47
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAE 10580 bytes