Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e443f96c3c259a9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-16 20:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3410bd3b1844fc464922b21a90cac63a SHA-1: 66bcb87f31c0d64965c1cc197b960e22a37826e2 SHA-256: 6e443f96c3c259a9c45155aabca20d4fd040c6dbb9e9b7379452d080c3009f2f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL (https://ttraff.ru/pify?keyword=bk+all+songs). Another critical heuristic identified a PDF link farm, suggesting an attempt to distribute or host malicious content. The ML classifier strongly supports the malicious verdict. While no scripts were extracted, the presence of malicious links indicates an attempt to lure the user to a harmful site, likely for phishing or malware delivery.

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/pify?keyword=bk+all+songs
    • http://files.stephanieruthkane.com/uploads/1/3/1/4/131437978/aad70c735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/7440727323.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/nekuxezaxefutatamewosolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3149/3784/files/90699349955.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8623/files/operational_organic_chemistry_lehman_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0440/0214/8510/files/security_plus_study_guides.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/zekemotaravep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/minotuzukudisom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/pivevaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/sausage_party_watch_online_2016.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_off00006268.bin
54b7b1651ed1dadabfae68d9032ccd8b90e0c413e30d41f11a07210a267e053c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6268 4868 bytes
font_01_sfnt_off0000730c.bin
893cc8887dff099f96ec70c96c4fe3d64a4526e3eaef126977e0a6a25c4257ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x730C 14324 bytes