Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c885b333d15c1be…

MALICIOUS

PDF

45.8 KB Created: 2020-08-30 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d098281f44cdfa859c6210a44714e6a SHA-1: f891e608815b45ae6271eb934e11ac113a22d040 SHA-256: 3c885b333d15c1be0a0ed88c114e7ead8ec8f2abdf02426e42f7cc484ee2be03
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=asi+se+dice+level+2+textbook+pdf'. The document body, though heavily obfuscated, contains text related to 'asi se dice level 2 textbook pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=asi+se+dice+level+2+textbook+pdf
    • https://static.usrfiles.com/ugd/b8c837_33c74c94f37c4cddb48eb36e31851825.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b25b80b365d4e4b9469ac05a284220d.pdf
    • https://static.usrfiles.com/ugd/1decf9_4d4840fe807742d5be2f18ffc51ceec7.pdf
    • https://static.usrfiles.com/ugd/97368a_4d44301ac90e497abafcdc6ad173bec5.pdf
    • https://static.usrfiles.com/ugd/ade4e6_25c1343f6f1840e6b2be54717f44d507.pdf
    • https://cdn.shopify.com/s/files/1/0434/6442/5622/files/31200967147.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/cursive_writing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0464/4975/4280/files/windows_10_home_latest_build.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/91047443466.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/the_baldrige_framework_for_performance_excellence.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/equations_with_variables_on_both_sides_practice.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/tutorial_autocad_2020_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/cwms_4._0_administration_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6839/files/83240968645.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/7169202446.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/33154361917.pdf
    • https://cdn.shopify.com/s/files/1/0431/6636/7895/files/shin_hokuto_no_ken.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006800.bin
22a5a782b18ae6aa2a6c6e2be604f81e18943d82691f233dc87e7c30230b53c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 4980 bytes
font_01_sfnt_off00007903.bin
14663f5c05989b84366a8a637898fd2ce4ce198c1162be8bf3b6693543a78730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 10288 bytes
font_02_sfnt_off00009bff.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFF 4324 bytes

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