Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b86c35e2ee907b7…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 09:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 085271ebb456f554ff85328cd68d088f SHA-1: cdc5d69fcfe4e2b23c01646cd1589e85f575adf0 SHA-256: 9b86c35e2ee907b7bbcb3bfda6f462588e8736ade6932c31a32ffd7c89941242
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a link farm, containing a large number of embedded URLs. One of these URLs, 'https://ttraff.cc/wix?keyword=al+que+ingrato+me+deja+busco+amante+analisis', is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains what appears to be garbled text along with the malicious URL, suggesting an attempt 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=al+que+ingrato+me+deja+busco+amante+analisis
    • https://static.usrfiles.com/ugd/cf79db_3d0b0c25e1734b9686becb61984493ad.pdf
    • https://static.usrfiles.com/ugd/08fe48_c3a3d51e39d74802b1fa3dbc7db78168.pdf
    • https://static.usrfiles.com/ugd/b8c837_096c9ef2c21d4edd99528077ba3309ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcbed99362e3420ea838c0c4bbed583e.pdf
    • https://static.usrfiles.com/ugd/0f5b72_c70db782e24f4565be096f062e2f0553.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3dcc434ccf4713bb7ef50dd056a26e.pdf
    • https://static.usrfiles.com/ugd/299074_432f82e14cb44a9c910ed80d707d56bc.pdf
    • https://static.usrfiles.com/ugd/7f16bd_667c2972d6154987ac361813508b81a2.pdf
    • https://static.usrfiles.com/ugd/4b7290_9cbbb6ff0f9c4d8fb539c22af86c6759.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/badoxawoxev.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/vibijetobomines.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/python_dbf_to_csv.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/98059986134.pdf
    • https://cdn.shopify.com/s/files/1/0461/7830/4154/files/luther_s_sacristy_prayer.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/wuvifugezazekirimevisox.pdf
    • https://cdn.shopify.com/s/files/1/0465/1106/3190/files/40115447405.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4459/files/29294254285.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/93798139664.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_off000065a4.bin
a76cf7411037dde355fb7748ff2bc0bf70f2f464fc282a9e42139092071b56c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A4 5588 bytes
font_01_sfnt_off00007880.bin
04b182b7b7cb67211075dca178410bddbaa4dd736ac49c18d2305e60499359ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7880 11332 bytes

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