Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c4b84fe097fcbd…

MALICIOUS

PDF

41.0 KB Created: 2020-08-18 16:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21bbed8e09ee0ceb673a300a5aa97955 SHA-1: 0b63b365aace3008368308ae1a4590a90e903609 SHA-256: d5c4b84fe097fcbd20f8a026e973c05f8a47ca0d5862acc02e191e7423d7ff5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a significant number of embedded links to other PDF files, many hosted on Shopify. One of these links points to a known malicious redirector (ttraff.com). This suggests the document is part of a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=bharatanatyam+songs+ing+com
    • http://besud.yeshairextensions.com/uploads/1/3/1/4/131408999/viramopob-nugasu.pdf
    • http://files.thaliaestrella.com/uploads/1/3/1/1/131164479/sakigisebem_xukubege_tufiwevibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/xisudidizo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/12104830221.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/automorphism_definition.pdf
    • https://cdn.shopify.com/s/files/1/0436/4982/6969/files/depavonimuvuvem.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/13308727223.pdf
    • https://cdn.shopify.com/s/files/1/0434/6445/8405/files/example_of_application_letter_for_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0448/1817/0018/files/mumavex.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/soviwetisujagem.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/catfish_farming_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0438/1150/4288/files/picsart_app_for_pc_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/16062925129.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005795.bin
3b446e6a7bf7edb5ec0c95bb14c1fb722083c040d428d7f4cc2979569de2513e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5795 5332 bytes
font_01_sfnt_off0000698d.bin
0e0648dc5c0ab4b2863c29221223f5ca618b6755547b33436790da472a02cfe7
pdf-font-stream PDF embedded font (sfnt) at offset 0x698D 2980 bytes
font_02_sfnt_off000075a9.bin
6fb1c360b22278925b9f1936e94ef932b33ed67378009a52d0c24fd86e5148fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 9792 bytes