Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9e76be646da491…

MALICIOUS

PDF

37.0 KB Created: 2020-09-04 05:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 278ec039fb4c10f89ff8d996b53892dc SHA-1: 57557f5083b12f8b1ed8bcc63a0458f7cd4af9c1 SHA-256: 4a9e76be646da4915bfa11634b4b919c5d075b1860bf9c594695ad8c3b82ae4e
154 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, characteristic of a link farm. One of these links, 'https://ttraff.club/pify?keyword=boekel+incubator+manual', is identified as a known malicious redirector. The document body appears to be garbled but contains references to the same URL and other PDF links, suggesting a coordinated effort to distribute malicious content or traffic. No scripts were extracted, and the primary malicious activity observed is the redirection via the embedded URL.

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.club/pify?keyword=boekel+incubator+manual
    • https://static.usrfiles.com/ugd/b8c837_0202632f4e124db693db91f62f856c52.pdf
    • https://static.usrfiles.com/ugd/1ebe14_b9dfbb569fc449a285195619a5cc4436.pdf
    • https://static.usrfiles.com/ugd/79e0dc_8e68a7855f47416f8b767a43f3ab1c2c.pdf
    • https://static.usrfiles.com/ugd/4dd980_0367a8e3896d476598039ae9f4e04058.pdf
    • https://static.usrfiles.com/ugd/fdee49_fb851848524e4a7bb2428b790e11398c.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_cf8e4e8ffaa74b6fa46522c8c41c2755.pdf
    • https://static.usrfiles.com/ugd/18ee90_20c608ae05fc4c00a87fb1ef0051396a.pdf
    • https://static.usrfiles.com/ugd/a31856_d06fbd287218440ab7734606a98dc234.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3841e60a445598df8d3c5c2635e84.pdf
    • https://static.usrfiles.com/ugd/3f4b99_6e1f8017b310494c9f2f864a31f8f38a.pdf
    • https://static.usrfiles.com/ugd/4b7290_37dfca3e14874de48028e63b28572384.pdf
    • https://static.usrfiles.com/ugd/4dd980_ceb657c12a0c435eb29b7cba3e2acdb7.pdf
    • https://static.usrfiles.com/ugd/3254bf_5150e2225c7b49738da51d7d1de94980.pdf
    • https://static.usrfiles.com/ugd/57c819_bfc42745daa24ebc8cbda454717d082b.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_off00004d34.bin
b6e809ff74eca07536c585404692a8671df0ce7eee771c4c2dfcff2f74ec6ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D34 5020 bytes
font_01_sfnt_off00005e3b.bin
64357f2f938cbae828852fbcc338f1a3d1f9ad60e98e88f7531a8f1e10918f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3B 12976 bytes