Malicious PDF — malware analysis report

Static analysis result for SHA-256 2526f23095e397ee…

MALICIOUS

PDF

37.2 KB Created: 2020-09-18 06:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 158f53dbb32ad73a35ce5ab7d5a220a9 SHA-1: 4ec3979865d72302c98eb8fde89d94c880f46024 SHA-256: 2526f23095e397ee6c6806d1502e6682625a897e17449bb546d35745cf99e961
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=introduction+to+chemical+engineering+thermodynamics+6th+edition+pdf'. This link is disguised as a textbook download, a common social engineering tactic. The document also exhibits characteristics of a PDF SEO link farm, with numerous links to other PDFs, likely to improve search engine ranking for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=introduction+to+chemical+engineering+thermodynamics+6th+edition+pdf
    • http://files.crossncrown.org/uploads/1/3/1/8/131857390/21981a4748.pdf
    • http://files.girlaquarium.com/uploads/1/3/0/8/130813639/tonemutagulir-sifativis-bonofi.pdf
    • http://migiz.marissaseancruz.com/uploads/1/3/1/4/131410399/kipojodawoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/56870747223.pdf
    • https://cdn.shopify.com/s/files/1/0434/1150/5302/files/osrs_devious_minds.pdf
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/jamubatun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0122/5114/files/lonekoperawegolamevokowo.pdf
    • https://cdn.shopify.com/s/files/1/0484/2632/0040/files/pisixoseralarizurigel.pdf
    • https://1d6caa75-a575-4db0-bc85-ad2b03919359.filesusr.com/ugd/38062a_0f73850d93b2465b96cb5707dc4dd916.pdf?index=true
    • https://4b7e8978-cde1-4685-bf27-98c62340e6eb.filesusr.com/ugd/277b62_38b335814d6d4f9e99508262619a6bd3.pdf?index=true
    • https://e7d668ac-85b6-4f03-9e37-1bc460f7bb2a.filesusr.com/ugd/fd7405_c19275e9ae2d486bbbeb530b1423b279.pdf?index=true
    • https://0edf84ef-6682-4759-9a6c-ad74c481fc5b.filesusr.com/ugd/278743_d6223c8b32e84800a2b42d86c57acc04.pdf?index=true
    • https://c94756d8-77fc-47e7-906f-338ef1968e16.filesusr.com/ugd/74147a_7cbe1be6053745f7b68e1970eeaff7e4.pdf?index=true
    • https://878da0ba-b8cf-466e-b767-0904e0bf54c4.filesusr.com/ugd/9ced5d_12e56019313b4ede8ed77162d1c19051.pdf?index=true
    • https://caeb386e-4b57-476d-83bd-309953459d29.filesusr.com/ugd/850f07_f78bb38353a147139c49a32dc35cb557.pdf?index=true
    • https://e138f13e-b122-409f-abd2-697b5313841c.filesusr.com/ugd/0bcf16_5fe2f1bd9b0a42b18cdd375dd1109150.pdf?index=true
    • https://8a99384e-aca9-4fe3-b1a6-7c3fcdbebe39.filesusr.com/ugd/b50c55_2f6ee4e23f634ff3ae0dff9a73eae56d.pdf?index=true
    • 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/
    • https://caeb386e-4b57-476d-83bd-309953459d29.filesusr.com/ugd/850f07_f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051e8.bin
8c4ad63f7239e9ff89d97355026890345417567efc4f8a09b9ba1712e507e49e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E8 5760 bytes
font_01_sfnt_off0000655e.bin
eee34db888956a07034e61382d8be2ec85fdec6decce2e982702debe645e869f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 9904 bytes

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