Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe91c636afedad5…

MALICIOUS

PDF

36.1 KB Created: 2020-09-02 08:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9bc1b7d5dc7d5564cbd09dc4629f21 SHA-1: 20419369c38102780f3dfeaa75a1441dd6343707 SHA-256: 5fe91c636afedad5819cd0a14ddf0d493fa72a1e6d9ba1ce6727a4f5d68a451e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector URL, suggesting it's part of a phishing campaign. The heuristic 'SE_MFA_LURE' indicates the document is designed to trick users into providing sensitive information, such as MFA codes or credentials. The embedded URLs are likely used to host further stages of the attack or to redirect users to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.me/pify?keyword=whirlpool+duet+ht+washer+manual+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4098/1670/files/44040320521.pdf
    • https://cdn.shopify.com/s/files/1/0439/3874/2430/files/defatawadekokunalofetun.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/zelasegupodilapofaxo.pdf
    • https://static.usrfiles.com/ugd/bf0735_0ba7e9e1f1174952b5cc7bd1bffb50d4.pdf
    • https://static.usrfiles.com/ugd/738632_549a54d5acaf4b7b8676f6e510a5eeec.pdf
    • https://static.usrfiles.com/ugd/4c1554_f1d716a5a9304d6e84df59f0c84235a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed426657fc0c469bba22da7019b26597.pdf
    • https://static.usrfiles.com/ugd/9c66ff_0bb93c37df604f4bbae8ccf1d9fe8d11.pdf
    • https://static.usrfiles.com/ugd/63022f_366d9509979747a681e0166fe2b02961.pdf
    • https://static.usrfiles.com/ugd/b8c837_844f99191be048459ebf93f46e03fc78.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/astral_chain_costumes_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/worerapuzur.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f4b.bin
bbd7d6f296232fcfe074dc9c783bf0c2aab0f2a8339a7ee04e51516365c5879b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4B 5388 bytes
font_01_sfnt_off00006185.bin
694c64679104a5413ea79bbf7f44d46c17dad6e9338fb1e27f3bda03740a280b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6185 10000 bytes