Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca6fef309ed2fc2…

MALICIOUS

PDF

39.6 KB Created: 2020-09-04 18:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9bae1c2e3bdb1bb8899c7d2759243a3 SHA-1: 0675c847364625c4debee6c4b495b484b8e9f184 SHA-256: dca6fef309ed2fc20685c3ca3136e232d8ad54b48f920c75cde8acfd25f1d09d
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector (ttraff.me). This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or scam attempt. The document body, though heavily obfuscated, also contains the malicious URL and numerous other URLs hosted on Shopify, likely part of a link farm to improve SEO for malicious content. No scripts were extracted, but the primary attack vector appears to be the malicious URL.

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=shirt+cutting+telugu
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/38924258499.pdf
    • https://cdn.shopify.com/s/files/1/0429/3784/3871/files/18251760932.pdf
    • https://cdn.shopify.com/s/files/1/0464/1708/4584/files/zeiss_axiostar_plus_microscope_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/31792391112.pdf
    • https://static.usrfiles.com/ugd/74a852_495a8e29fe3e4be8a901c297a5b3c610.pdf
    • https://cdn.shopify.com/s/files/1/0432/6558/9414/files/48116764600.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/d_d_descent_into_avernus.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/83135513708.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/all_laboratory_apparatus.pdf
    • https://cdn.shopify.com/s/files/1/0443/8815/5558/files/method_validation_parameters.pdf
    • https://static.usrfiles.com/ugd/6a7407_ac0d6328899945b296325f6e5cdf6b4b.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_cf2755dfc3944285a4d88fdeca0e5a2f.pdf
    • https://static.usrfiles.com/ugd/3649d2_7fe29ffa61ad4b69bb68a30488262064.pdf
    • https://static.usrfiles.com/ugd/b8c837_30e52e76c26a4a27a458c873ae60bbbf.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_off00005e57.bin
e7250988e93794099a0ad6110a090d8d48a61f863fa8ef7125f2e76d537f499b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E57 4776 bytes
font_01_sfnt_off00006e95.bin
9ac3218c3e7abc4b2a9f4dd36f090b964ee675431d1a782cf4fb90c5a96d9ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E95 10380 bytes