Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9e1cd6026900e0…

MALICIOUS

PDF

44.4 KB Created: 2020-08-31 18:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 370a42b9a79b55b14669fe1207903eff SHA-1: 2d46f5550256e935f16da7008c11cf8955754ce5 SHA-256: 2b9e1cd6026900e0a51d240340c06dfbd439ae50898e972fca52a508075f80a5
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector URL (https://ttraff.cc/wix?keyword=adjectives+synonyms+and+antonyms+exercises+pdf) that is flagged as malicious. The document body, though heavily obfuscated, appears to contain references to educational materials, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=adjectives+synonyms+and+antonyms+exercises+pdf
    • https://static.usrfiles.com/ugd/b8c837_e4aa6b03043540a28a1ca0aa45a52158.pdf
    • https://static.usrfiles.com/ugd/f459ea_5ddbc89960b546f5bab61c59abca2ddf.pdf
    • https://static.usrfiles.com/ugd/e8506d_bc5b0ef7ea4441aa8dfac04650ccc907.pdf
    • https://static.usrfiles.com/ugd/b8c837_10ef68244060448abd7ba5d1a41ddbec.pdf
    • https://static.usrfiles.com/ugd/191a6d_2bbeac128a3142909792845231573a13.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/choose_the_right_sentence_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/93_suburu_legacy.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/18155443664.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/10432063933.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89112dd1c914b419281e2aed22d17e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cc335b926d94dda95873f10afd7f546.pdf
    • https://static.usrfiles.com/ugd/ea78e0_76575bd45da94af9ba650a2b3199f83f.pdf
    • https://static.usrfiles.com/ugd/ade4e6_0278d44b8c4d41aa8e446be4c336b0f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_53b0291f9c78495bab1a7d9d37955ae1.pdf
    • https://static.usrfiles.com/ugd/c1615c_2b89e7c331aa42319d4ba24caff04c0d.pdf
    • https://static.usrfiles.com/ugd/c0b427_489599de7fc54502a10acc932b2020cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e7d491488694388b49b5e72010ebf10.pdf
    • https://static.usrfiles.com/ugd/0c41e7_d52b1d1223ee4f0785a1c35717103b49.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_off00006d1b.bin
d146c926986e3b7cf4d84948aa8a1fcb44af452bbc0f7f6e2c0a1abedc4aa195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 5564 bytes
font_01_sfnt_off00008005.bin
9d4d944893183e4ffbc81c557383ca278ef01a8eba6f8b2c46f65e0b19698b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8005 10748 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.