Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f285a21379e7a9…

MALICIOUS

PDF

35.8 KB Created: 2020-08-29 09:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd8c860c057bcd7502afcc010da089e SHA-1: b2dfef493668cb84db14e216fe44fa91ccad26fc SHA-256: f3f285a21379e7a95b22c41f7dfc57ab223296d65b6d8d815091a888530d0798
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, a technique often used in SEO poisoning or link farm attacks. One of the primary links, 'https://ttraff.com/wix?keyword=superfighters+unblocked+games+at+school', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to similar URLs, reinforcing the link farm attack pattern.

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.com/wix?keyword=superfighters+unblocked+games+at+school
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/zasetowedi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/nutuwuvimajof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/44766779391.pdf
    • https://static.usrfiles.com/ugd/b8c837_a16243ebcdbd4868bbc87085dd1323c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a52c3384528c42f8ad4560c85f05aa5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0211ac8a26b74ddd899207dd28056655.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbe76b9d7137435e93c2877a7f80acd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_add3f8f655134f2aa430dc82e20bad9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_edf34281e076497fa78759fc38a0a2a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_195e06c7da894170a91d6081932901e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0b3df93f20043799d682bf0cacd5b7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6a9e8a912694c90b04776d45c4eebdb.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4650/files/kejuroreluvij.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8382/files/52754048909.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/35797206225.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/11093249723.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0496/files/novifowenigiboxag.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_off00004d4e.bin
d30aa5dc795da9812b349a952a3c175f84c8efe661d06c4f1a2658b59039f39e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4E 5876 bytes
font_01_sfnt_off0000611e.bin
581fa8e1dd184623049e366be195e396187721f9186367b2fa8119909dd75f49
pdf-font-stream PDF embedded font (sfnt) at offset 0x611E 9716 bytes