Malicious PDF — malware analysis report

Static analysis result for SHA-256 088edd7a816b5e96…

MALICIOUS

PDF

40.0 KB Created: 2020-08-02 22:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0146785fc76524da5c1f45fdd5a97a47 SHA-1: 6a6ef089206cc8390e0bfdb2d4fa382224b13e3e SHA-256: 088edd7a816b5e9654116b39f5f5955b3045913b54179ce7577fa446b9e34f31
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One prominent link, https://ttraff.ru/pify?keyword=practice+it+answers+bjp4+self-+check, is identified as a malicious redirector. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common social-engineering tactic to facilitate malware installation or credential theft.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/pify?keyword=practice+it+answers+bjp4+self-+check
    • http://files.cdpirelandnetwork.net/uploads/1/3/1/4/131409158/9bdd2510a97230.pdf
    • http://files.kmzafm.com/uploads/1/3/1/8/131856543/35708.pdf
    • http://files.alcmadison.org/uploads/1/3/1/4/131407102/1884039.pdf
    • http://files.gertybrown.co.nz/uploads/1/3/1/8/131856146/69f4b.pdf
    • http://files.lionsclubofharrison.com/uploads/1/3/1/4/131414134/6256110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/maduzefedejim.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4237/files/harry_fucks_hermione.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/rebudotonetexipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/xufapabobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8685/5840/files/xanefuxez.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/dream_league_soccer_2016_logos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/lulitetirowupifexevud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5883/files/3059828581.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/51377580351.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1376/files/4125795931.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_off000059b4.bin
b905e7a8ff6d6e38e7230fcb95b9a1686b9dc474b10eb128f748beb90ae25bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B4 5596 bytes
font_01_sfnt_off00006cd1.bin
2d555d090475c548c94cea324227db1d906e0d0808c0313696f30b1b5254f69a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 11664 bytes

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