Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f11e11ee48f0fca…

MALICIOUS

PDF

45.2 KB Created: 2020-09-16 20:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02283ebbdcae0fe410e0536e47e94ec0 SHA-1: 33226cc5d254372ac50139ec3333b3d914b5f3ee SHA-256: 6f11e11ee48f0fca89de74ed0c8eb42e46e5ce5436a4204d9e02a81202555689
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract traffic and potentially lead users to malicious sites.

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.ru/wix?keyword=economic+differences+between+north+and+south+europe
    • http://mepon.anchordsudz.ca/uploads/1/3/0/7/130774977/2529490.pdf
    • http://files.hivoltcoffeepickup.com/uploads/1/3/0/7/130739802/806ca0e4e1ee39.pdf
    • http://bupebut.unionchapelmonroe.com/uploads/1/3/2/3/132302780/50201ad8bc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://956fb326-03b1-4eb1-a2a3-c6a03e929304.filesusr.com/ugd/3bcfef_7844f3dc2e664024b3336ef4856bf6c1.pdf?index=true
    • https://52693125-699a-4c0e-9391-3b1fd9a0003b.filesusr.com/ugd/8e7730_dfe0197407e148f6b18f6be3a141e5b9.pdf?index=true
    • https://080b59ee-3eb4-4383-a0fd-ec0305117531.filesusr.com/ugd/02631b_841ad09107fa49d6b58a22f0a295fb7f.pdf?index=true
    • https://fd4967d7-afa5-476c-842f-c5ea6851d970.filesusr.com/ugd/bdc04d_f2385221e4844d1fa1ebdaf1bb226836.pdf?index=true
    • https://75436a80-1371-45a9-a0e0-ceb48f4af1c3.filesusr.com/ugd/6f5f23_ab70c3cedd75427d831fad195f8ede36.pdf?index=true
    • https://f687ca6f-7e58-443a-8439-d4e38ca5f02e.filesusr.com/ugd/37987b_df94fa56eab64536b05fcbf85619e43c.pdf?index=true
    • https://f9abf645-37e6-41f7-be49-31337f5be841.filesusr.com/ugd/dcf9ad_904229fd8f604ef680b5c444e05bf552.pdf?index=true
    • https://13b0b5ae-f046-4e6f-abc4-5bfe1fab81a3.filesusr.com/ugd/4cd51e_e3a6f246c2154b1fa93bb9043cf1270b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/3676/0485/files/hydroxyl_ammonium_chloride_sds.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2902/files/yamaha_htr_5940_service_manual.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_off000064f2.bin
1af9f27caa49e01618875b63d26f39f23aab48077363d9b570e4fd751847339a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 5436 bytes
font_01_sfnt_off00007740.bin
260ff793582dc9f3c8018aa6ce937f46fc8d51ef9bf69225587d1e7f20bb7f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7740 10072 bytes
font_02_sfnt_off00009997.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9997 4324 bytes

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