Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bb85eab567c9cf…

MALICIOUS

PDF

49.2 KB Created: 2020-07-29 18:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d34cf20ebd0205e277c5d4bff674ec0d SHA-1: ec3804c94a63f1afeed161d09ea97f9bd09fc3b9 SHA-256: a7bb85eab567c9cf8d8b9dcb7a8d44f61b498d6a2aed1240986aed9bf2e4c774
152 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The ML classifier strongly flagged this sample as malicious. The document body, though heavily obfuscated, appears to be related to 'cours agriculture urbaine pdf', likely a lure. The presence of numerous external PDF links suggests a link farm or redirection strategy to distribute further malicious content.

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.com/pify?keyword=cours+agriculture+urbaine+pdf
    • http://files.counseling4success.com/uploads/1/3/1/0/131069869/1b840.pdf
    • http://files.theroute92.com/uploads/1/3/1/4/131410012/3484041.pdf
    • http://files.cathyrogersart.com/uploads/1/3/1/8/131856163/fapid_wewinufakut.pdf
    • http://files.theneoneffect.com.au/uploads/1/3/0/7/130738764/8579411.pdf
    • http://files.footlightstheater.com/uploads/1/3/2/6/132681878/5fe0841f1.pdf
    • https://cdn.shopif
    • https://cdn.shopify.com/s/files/1/0441/4459/1000/files/78622016082.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/kulobedifez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/bapivuvevog.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/roforafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikujolam.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/bowoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/57052122583.pdf
    • https://cdn.shopify.com/s/files/1/0431/8248/9762/files/notukaporowunuv.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/46487730539.pdf
    • https://cdn.shopify.com/s/files/1/0437/3938/1912/files/redojuvejom.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_off00007c8f.bin
47bba95a157678a6b10113226d4703c951c88f24e16997846d369c0a9ef08806
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8F 5368 bytes
font_01_sfnt_off00008ed7.bin
32a989101598da598a6f58684a3ebc3a9b2906ab3073794426e69d9e717524bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED7 12880 bytes