Malicious PDF — malware analysis report

Static analysis result for SHA-256 8281a6e7949441e8…

MALICIOUS

PDF

52.2 KB Created: 2020-08-17 08:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bce40ca44050db0a194642045e70732 SHA-1: 8cb92b9fdc76edc03d03ff3c57e657f1cac78ff5 SHA-256: 8281a6e7949441e861cb629e086f4a8cb7046c4e84a90f097dd87808e286efcc
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The presence of a lure to enable macros or editing, combined with the malicious redirector, indicates an attempt to lead the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.com/pify?keyword=calendario+2018+pdf+meses
    • http://files.cincinnatitreepros.com/uploads/1/3/1/4/131438274/wagugixuzom_tatunuviboxu.pdf
    • http://files.meadowandfawn.com/uploads/1/3/1/3/131381976/1068428.pdf
    • http://files.eastkentleafletdistribution.co.uk/uploads/1/3/0/7/130738639/863c0be64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/guided_fishing_trips_in_oklahoma.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/46550609841.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/duvefimimotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/31071453718.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/kewaburijegodifobudolil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/xibegamozek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/376771033.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1449/files/wojato.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a7.bin
e94dc439706b269492292e36d358b953dae3e891e1036b7801c9eaac8b2de251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A7 5436 bytes
font_01_sfnt_off00007b03.bin
6e88ab50efaca05ff56981b089f52f8f5fe308a296c089f242cc21606111eb6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B03 11032 bytes
font_02_sfnt_off00009ec2.bin
b422167e406e14456d8c777e36f465b0cf7a3429615eb346a55b07892fc128e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC2 16224 bytes
font_03_sfnt_off0000b3e9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 4324 bytes

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