Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f44fbaff0ed3a8…

MALICIOUS

PDF

48.9 KB Created: 2020-08-30 14:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 022788ff08613fab6bbefb63701954da SHA-1: 2343c15d572d648acb33c1d85d5a33af32699366 SHA-256: 33f44fbaff0ed3a861ac5e6068ed958f125b1593dd4ac4a12a9e042789865672
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that suggests a lure related to 'corrupted tabula rasa'. The presence of numerous external PDF links, many of which are benign, suggests an attempt to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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=corrupted+tabula+rasa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_681f2cc7fc5c4ddc8bff164975e67588.pdf
    • https://static.usrfiles.com/ugd/6116da_7e51e173e315496aad01081a150b5d4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_255247082a2043cfad4a63756a91029a.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/joramogazu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/nuxekamaninatojikegego.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/bijalosafiselojibutidutij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9109/9805/files/idontwannabeyouanymore_piano_sheet_music_with_letters.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/sewage_treatment_steps.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/mowaxejepevipupesabi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1808/files/81248307481.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_cf4b3c0b9fe74700afd1aa292190ec58.pdf
    • https://static.usrfiles.com/ugd/b8c837_0509c4930e4f42fbb07dcd56a78f5ac6.pdf
    • https://static.usrfiles.com/ugd/fa6f14_cd3546f316d642d591bcf45fc6787722.pdf
    • https://static.usrfiles.com/ugd/b4609a_51a63284215e4539b3779bb66055d93f.pdf
    • https://static.usrfiles.com/ugd/b8c837_87cbba97ed3043f890761bdf6991f9dd.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006886.bin
1aaac6212e8cfc9e56f72e89988b07dab4bdc760b91f373cac0e11b629df9903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6886 4844 bytes
font_01_sfnt_off0000790b.bin
65c413b7f4daa86c9127736b1f58e6be8c944fe4314c7171a387e8618886a5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790B 14932 bytes
font_02_sfnt_off0000a8ce.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8CE 4324 bytes

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