Malicious PDF — malware analysis report

Static analysis result for SHA-256 b401a884c5d782e5…

MALICIOUS

PDF

41.7 KB Created: 2020-09-03 03:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2559fcdb205a1f80e8ecd4764d2964aa SHA-1: 60836e37bbc42a0cbdd32ef08d3c9f9a966b2cb8 SHA-256: b401a884c5d782e576ed3aed2ce578d1344fa39d37cb39bd0de5167c20001ede
154 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, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=misplaced+modifier+worksheet+high+school', is likely intended to lead the user to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a broad distribution or SEO poisoning tactic. No scripts were extracted, but the presence of a malicious redirector is sufficient to indicate a phishing or redirection attack.

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.link/wix?keyword=misplaced+modifier+worksheet+high+school
    • https://static.usrfiles.com/ugd/06497e_2318b6c26a4e4fce9091a4b97b485a34.pdf
    • https://static.usrfiles.com/ugd/455f95_f91e8120c5114f9da7c078f0dc9a0526.pdf
    • https://static.usrfiles.com/ugd/e6092c_c0a1e1c984c8462789e8bfeee77dd9ad.pdf
    • https://static.usrfiles.com/ugd/ea2f88_bf737536fa8b4420b3a0edd0d02e8f0a.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/shankar_quantum_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/87247086022.pdf
    • https://static.usrfiles.com/ugd/2ac701_51633b608af841199e02ac65c85d764a.pdf
    • https://static.usrfiles.com/ugd/b0cb2d_27eeaaa508764f8a81e715b0d4054bad.pdf
    • https://static.usrfiles.com/ugd/b8c837_67869d0b1a424653b7b6877be0e9f2df.pdf
    • https://cdn.shopify.com/s/files/1/0434/5643/0230/files/vesewawelixikesiberafuwak.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/kindergarten_school_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/xejivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/pixelema.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/kolosatubav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062aa.bin
4bed0a669c892cd7f487dd6460d592c3fa80a1e15bc9e0488831c987a19686c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x62AA 5728 bytes
font_01_sfnt_off0000761d.bin
96a0db40f2f5fc7987db83831c3889f3db122b7eed0b3f3a0cb066481496aa18
pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 10484 bytes