Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2dfe934d3a820f…

MALICIOUS

PDF

117.7 KB Created: 2020-10-12 22:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1621c80409c58765032e0fb5269f7f43 SHA-1: ea7fbdfa020659810c3784c0dbf8d9cf9cacdf37 SHA-256: 7a2dfe934d3a820fd25c87781f1ea8dbe6302da9afd8685b88b2672ea0d1a72e
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=t%2526b+cable+tray+installation+manual`. The document also functions as a link farm, directing users to numerous other PDFs hosted on disposable domains. This behavior strongly suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=t%2526b+cable+tray+installation+manual In PDF document text
    • https://site-1039634.mozfiles.com/files/1039634/31357055811.pdfIn PDF document text
    • https://site-1043537.mozfiles.com/files/1043537/54690765582.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/tivesufonikubol.pdfIn PDF document text
    • https://site-1043042.mozfiles.com/files/1043042/36753708088.pdfIn PDF document text
    • https://site-1039489.mozfiles.com/files/1039489/dimibujor.pdfIn PDF document text
    • http://potij.inticomposes.com/uploads/1/3/1/0/131070450/danejum.pdfIn PDF document text
    • http://files.northpikedistrictlibrary.com/uploads/1/3/2/7/132710714/setisifaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/005b335b-c3e8-44a4-952b-09cdf5dafd87/82233990965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85779ee-f794-4c03-a3c2-b89cadd90137/runujetuviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ec12f1-fe21-468f-b838-a940ca3313d6/96312921576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0906a8ca-342d-4b6b-bf65-642e2cdcb064/4754770645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8188/4067/files/14029613136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0905/9227/files/gujarati_khichdi_instant_pot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2504/6423/files/37713944948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9024/2455/files/aroma_rice_cooker_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1572/0093/files/imagery_in_the_book_thief_with_page_numbers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A41 2900 bytes
SHA-256: b7b260ddf4d191b6a327e24a8ce6e5bade73ba5b9f71a273ff02e8128d3bb49a
font_01_sfnt_off0001549d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549D 4104 bytes
SHA-256: f737d4ae1e0f617e8f6caff26011d35bdbbafdf965e2c276346733ff706e4866
font_02_sfnt_off0001628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628C 3992 bytes
SHA-256: 2140437293392dd0b6b6de4b124f7019cd241b6a815b4b7760c5e6b03b2e6da8
font_03_sfnt_off00017032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17032 18516 bytes
SHA-256: 2d2b94c8dca80a76aef99a920189e8db04dbd4d1e3bf278620c1091c7709e748
font_04_sfnt_off0001a95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A95A 16464 bytes
SHA-256: d610d3269392b38027ad629193f3f6e1193dba0614efe2c43639eba9bfbd28a1
font_05_sfnt_off0001bf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF59 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19