Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90224fff4e3b326…

MALICIOUS

PDF

37.7 KB Created: 2020-08-31 21:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9dc9682e0fc732ba8eb12b4e238b05 SHA-1: f25021cb3e3af6294a15a80d7d12eb1876e40d2b SHA-256: c90224fff4e3b326a4acfef290b7a5f25c19da7e045d856e7dc362e7a5ffe5db
152 Risk Score

Malware Insights

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

This PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=cafeland+apk+mod+unlimited'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure for downloading an 'apk mod unlimited' file. The presence of a link farm heuristic further suggests an attempt to distribute content through multiple linked PDFs. No scripts were extracted from this sample.

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=cafeland+apk+mod+unlimited
    • https://static.usrfiles.com/ugd/b8c837_703ffef223da4f76a51eb4bc49d24e1d.pdf
    • https://static.usrfiles.com/ugd/3bca44_982a08d1ccbc4bf6bea0953eb3790a3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_31d8d3c6d5164fb5966f5e86acc26dce.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/13362861837.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/fire_safety_risk_assessment_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/nipetovudaxatanezubero.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/98231429588.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/biodata_format_for_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/febibenemagina.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_off000056ec.bin
279444de1fcadc74e6cf60dee9ad21a5afd1882a755cda265fdab8e5f0cf01c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EC 4884 bytes
font_01_sfnt_off00006780.bin
e8d85a508262dd9cc475cbb545aaa1a4217f41f42643bcdb3b3c24efa3810061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6780 10352 bytes

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