Malicious PDF — malware analysis report

Static analysis result for SHA-256 16016dddb4f3d2b4…

MALICIOUS

PDF

43.7 KB Created: 2020-08-23 16:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208c9c55c8d8eb7c47cb4c16fe174249 SHA-1: 282e5039dba04d5659d6e0fef0ea413d211bd54c SHA-256: 16016dddb4f3d2b40fba3708ce92c2f9206aa0c969f373e2ecc9460c16eef471
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though partially corrupted, contains text related to an 'answer key' which serves as a lure. The presence of multiple PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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=aakash+aiats+answer+key+test+2+2018
    • http://files.meetingmilestonesinitiative.org/uploads/1/3/1/6/131606631/2489286.pdf
    • http://xulup.1corinthiens15.com/uploads/1/3/0/8/130874113/lokuzanosafajovowok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/vebajotogukowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/surikozed.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/tilurubazusakimorumagij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/jesorozijopaxolituxelikew.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/marvel_movies_dubbed_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/9535/0684/files/18407750831.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/46643736750.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/mw3_hacks_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/kataxuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/fuguvabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8123/files/0._as_a_fraction.pdf
    • https://cdn.shopify.com/s/files/1/0428/8711/9007/files/52767267969.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_off0000624f.bin
610bc0e5b31b0297b397aaf09274af1ac94cdbca198d380e983ea1f22f0e4232
pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 5508 bytes
font_01_sfnt_off0000750f.bin
1c0536514e3afbd27a8a4274c9f5d39c8ebfaff8f92303e89f59fba6354920c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x750F 14244 bytes