Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c219e408f300a5…

MALICIOUS

PDF

67.2 KB Created: 2020-08-21 11:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3913486264d1c9540149f2ef82603ef SHA-1: 948c1e4cac4700f0402863574c4b96acb319cf35 SHA-256: 25c219e408f300a503f24a5f0bc9133b3a2bc6233c040c393b618115b7113b63
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract search engine traffic and redirect users to potentially harmful content. The primary attack pattern involves luring users through these links.

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/pify?keyword=computer+hardware+and+networking+pdf+in+english
    • http://files.brokenknucklekustoms.com/uploads/1/3/0/7/130739099/6724690bd6b1.pdf
    • http://files.easep.org/uploads/1/3/1/6/131607053/5187816.pdf
    • http://files.cowgirlcoutureny.com/uploads/1/3/0/8/130873822/vevukow-zaxapozokaza-sazokabiwunuwi-legamixinema.pdf
    • http://fonumizi.ruthmurraywebster.com/uploads/1/3/1/3/131379326/5568643.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/zofasovurufupe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5363/5989/files/pezorupivanijik.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/sijewexesufogi.pdf
    • https://cdn.shopify.com/s/files/1/0448/3717/5456/files/github_readme_folder_structure.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/88943146309.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/65702037476.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/vapewot.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9507/files/windows_7_aggiornamenti_0.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/rijipejewolinilunurigopi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4198/0567/files/widufekumerireg.pdf
    • https://cdn.shopify.com/s/files/1/0432/1558/5448/files/14829528916.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/15848743217.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/
    • https://cdn.shopify.com/s/files/1/0430/4

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa91.bin
b3ab84d1b8e2b2a736c38b6407da2c88f2cc4c2f2cf5ed34ee5db4a96e47907e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA91 5516 bytes
font_01_sfnt_off0000bd41.bin
3f8466ca8acea9f6e67b86a9d5b52e604ec7c632daaf6efe4c5263aec2c03dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD41 10420 bytes
font_02_sfnt_off0000e10e.bin
876bc45f8115547cc0d5aaaf21385fcb3ce211e2abd4c4180af0b1d840e9dbf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 18752 bytes

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