Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbc80c26883b6e5…

MALICIOUS

PDF

45.0 KB Created: 2020-08-30 06:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d96e96eb1318af6989361efeb7bd3efb SHA-1: 56e541589e8ebcb3cb3560c975f416d34da9b00f SHA-256: fcbc80c26883b6e51cf982f766141aa109549d4d5982bf848e9d827bce3e3d40
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body contains garbled text but also includes the same redirector URL and a list of other PDF URLs, suggesting a link farm or redirection attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=preparing+the+tv+please+try+again+later
    • https://static.usrfiles.com/ugd/b8c837_91d4867ac1f04469b83472b97fd8454e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7547b62a960b4f7ba97de62b12829a1d.pdf
    • https://static.usrfiles.com/ugd/4b7290_dcd6eb65cb23498e87f080b577ae3f09.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/85237469948.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/71055834460.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2069fcc385d483c8417b5d2b6ac7d3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_233d63fd43384f64a6583dfb153e8502.pdf
    • https://static.usrfiles.com/ugd/314c35_81763035c4db40019d1f9fcff222ecbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_38511c11674340fa94f471187ca1020b.pdf
    • https://static.usrfiles.com/ugd/b8c837_39031162c1a244c890e29b41318ea892.pdf
    • https://static.usrfiles.com/ugd/f46427_921b7829353040159f42b37dfafd4ae1.pdf
    • https://static.usrfiles.com/ugd/253000_6f9ac9cd50624d8c933c5210a3fb0455.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c6863ba88144bb3a23b51bf74ff5727.pdf
    • https://static.usrfiles.com/ugd/b8c837_b19ae811a6e5425888552086771aff93.pdf
    • https://static.usrfiles.com/ugd/b8c837_59962bd600ad464d9eb0dc9e5e75b475.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_off00007171.bin
81335010deca308465536384cd6bc120ae657e0a7c53b8488bc37165e8a29e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7171 5244 bytes
font_01_sfnt_off00008341.bin
97b2a216c20f861e08081244e73ba1034d75384e20d7f0db23e3542edb9b6bd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8341 10608 bytes