Malicious PDF — malware analysis report

Static analysis result for SHA-256 a506988dd1be93d9…

MALICIOUS

PDF

46.9 KB Created: 2020-08-29 23:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 292139477d054fca1d571dfeefabf7c4 SHA-1: 3a9a2b55aef80e58ef0ddc903f46bdbf3d986be4 SHA-256: a506988dd1be93d9da8ba69a696a107b4cdd0f338ed0a7406bae37962eee167a
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, directing users to 'https://ttraff.com/wix?keyword=cash+management+pdf'. This URL is presented within the document body, suggesting a social engineering lure. The PDF also contains a link farm heuristic, indicating it's part of a larger SEO poisoning effort. No scripts were extracted, but the primary attack vector appears to be a malicious link embedded within the document.

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=cash+management+pdf
    • https://static.usrfiles
    • https://static.usrfiles.com/ugd/b8c837_fb8832ae30a74c23af99b700dc1bf57d.pdf
    • https://static.usrfiles.com/ugd/b58d21_bf546e4ff92e4a4485f3a9148ec7bdd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_eede28d44e994ed8ba76f8573931113b.pdf
    • https://static.usrfiles.com/ugd/4cf28d_afd5abe9a8e44caa99d705f9afe135bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b2ea211f6774780906f6e8b7e9151f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_17821927c5e34fd98c198a30765cdcdf.pdf
    • https://static.usrfiles.com/ugd/362633_5e9b8ce5e1644fc09f9c37a59652b6ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_29d15258593e44d387c7d55473aceaf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_940384b7959d48c39fa2658203273150.pdf
    • https://static.usrfiles.com/ugd/b8c837_590ecfa9c212456080d2cc9d8e5beffb.pdf
    • https://static.usrfiles.com/ugd/b8c837_22bc19524ce3429b82a7f7c3e132ef20.pdf
    • https://static.usrfiles.com/ugd/b8c837_232b2ce46f504b449e36880dc647fa5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa1d48ee2241479585c769cc68060bd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_672df19a5cb5463dae8a535bd7d428c0.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_off00006c3b.bin
02946068e145de970bb9e98a3ee04bb48d1d1af3960bc26815c1f1e5387c79df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3B 4980 bytes
font_01_sfnt_off00007cfa.bin
3ffc204018f792a8c21e049c43ed5f9dcdabd147698ea6196af583e8c9164bee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFA 10504 bytes
font_02_sfnt_off0000a0d8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D8 4324 bytes