Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3af6c13603c55f…

MALICIOUS

PDF

41.9 KB Created: 2020-09-20 17:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75c29d18902cba82974e4febde0154de SHA-1: a3189c1a77038841f9914061ba05547d8a0e065c SHA-256: 5d3af6c13603c55ff7d0b66fad890a54087877321c3fe6c3cf39d7a8c9644e87
154 Risk Score

Malware Insights

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

This PDF document contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a manual. The presence of numerous external PDF links also suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the embedded links are sufficient to indicate a malicious intent to redirect users to potentially harmful content.

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.me/wix?keyword=detroit+diesel+8v92+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0704/8860/files/54120146144.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/cognitive_skills_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0482/9547/7410/files/43970477933.pdf
    • https://cdn.shopify.com/s/files/1/0463/3470/5821/files/43320792205.pdf
    • https://37ea7a0a-7c7a-405f-a7f4-f0ad51684d47.filesusr.com/ugd/abd6ea_43201af55a514b0d93545b897b84e614.pdf?index=true
    • https://907f91e9-c0e6-4224-b71f-e1002ee1a82c.filesusr.com/ugd/0182ef_332e31e31b7b48f39e49e7384bfd6e48.pdf?index=true
    • https://3fc0ff35-e0f0-47d6-944b-441bfb29d59d.filesusr.com/ugd/e78b77_a995a1a39c494da8ba447cdebb4d369b.pdf?index=true
    • https://70365e3a-b361-4282-b8d4-7cb35714e875.filesusr.com/ugd/4a2613_2991d9cff4ce414cba2c29e8f00ffca1.pdf?index=true
    • https://cbdc8025-8046-47a2-99bb-c2be3429304b.filesusr.com/ugd/3bbd68_f7bb112d357e4f36a6ad7c27fa4c9a37.pdf?index=true
    • https://0f7d9544-aace-483c-8041-75aa44320ca6.filesusr.com/ugd/d4c4cf_8d144836cf254003bc77ab5062aa0cca.pdf?index=true
    • https://c5cf275d-fd3d-483d-b187-1e536341da28.filesusr.com/ugd/229b11_26464b6087344c0c82bf626051cf15e8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/72481342146.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/xuvowizepibawi.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_off00004da7.bin
959a73f03ebf19336be399c6ba3ef2c03d35d1dc1c1e9ecee6783b9bcaca8525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA7 5392 bytes
font_01_sfnt_off00005fe6.bin
819ad45411b3842ce36e6dc0c227c05d84c19df43bbb3716fd7651af0a27ce0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE6 14584 bytes
font_02_sfnt_off00008d2a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2A 4324 bytes

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