Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b961a13f31eeeaf…

MALICIOUS

PDF

49.7 KB Created: 2020-09-01 14:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e561d76c7456be0764ef9b49c886b1e SHA-1: 52ee6ceccd989791db8c6a44ed2ebf851a6c4d89 SHA-256: 0b961a13f31eeeafb43e1737ffde93d94a75b23b46d5a4622956dfe92eb6e561
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.club/pify?keyword=chess+3d+game+free++for+pc', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to a 'chess 3d game free for pc'. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. 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.club/pify?keyword=chess+3d+game+free++for+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/8d0191_dec1873d10044e369719b64e39c3d370.pdf
    • https://static.usrfiles.com/ugd/90423f_cd7832cfcd4041a496a43926e3a694f7.pdf
    • https://static.usrfiles.com/ugd/bb13a2_6e037328a6e64a9f9ea856d5ea988fb5.pdf
    • https://static.usrfiles.com/ugd/c12414_4a21116e5dff4d45a80d8f29665467e4.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/67250584269.pdf
    • https://cdn.shopify.com/s/files/1/0435/4437/9546/files/adventures_in_middle_earth.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/19270948231.pdf
    • https://static.usrfiles.com/ugd/0a052f_e06ce06919314c209f54830a08f27fde.pdf
    • https://static.usrfiles.com/ugd/9219f8_efa3db1ed7ed4991b3858580b0ea3596.pdf
    • https://static.usrfiles.com/ugd/eda9ba_5d317e705cbe43aaab65b3bf6813dcdd.pdf
    • https://static.usrfiles.com/ugd/a382ee_3b9f3a43d0f9489186d4bf29a68498a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e51eb82ffb154d6ea71517379899237c.pdf
    • https://static.usrfiles.com/ugd/dcfb95_492a698e9c4248918a9579d2e40ec5f2.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_off0000775b.bin
f4311d66ca7e1e30fa963227f13de46c9f1d0712834bf3e88e587314eea7de23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 5280 bytes
font_01_sfnt_off00008949.bin
b90769e6f1f1c56a752b3eada0f3243a7520393fab60ce0f7f3fb746b87d8f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8949 10220 bytes
font_02_sfnt_off0000ac48.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC48 4324 bytes

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