Malicious PDF — malware analysis report

Static analysis result for SHA-256 8935c3859a8c6422…

MALICIOUS

PDF

32.7 KB Created: 2020-08-06 02:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10773314ca3905063651a441968f032d SHA-1: 78343f9fe7700818afed2466c04d055f63ee17d8 SHA-256: 8935c3859a8c6422a86ab95824a9f624b043337ea75cd75e5c9fdb7bab69b1b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=tanaman+belimbing+wuluh+pdf
    • http://files.theredpillrenegade.com/uploads/1/3/0/9/130969297/kuxamopuruwa.pdf
    • http://files.imural.ca/uploads/1/3/0/7/130776022/ef0a88d9ca6fb0.pdf
    • http://files.ecodirectcleaners.com/uploads/1/3/2/7/132741375/4524406.pdf
    • http://masepazak.myapexhomeinspection.com/uploads/1/3/1/3/131384401/1506315.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/misote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7913659608.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/arabic_numbers_in_english_1_to_1000.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/jidaninexixejiragoxegab.pdf
    • https://cdn.shopify.com/s/files/1/0435/1626/4616/files/45530973202.pdf
    • https://cdn.shopify.com/s/files/1/0433/9308/9692/files/70519414239.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/57530810089.pdf
    • https://cdn.shopify.com/s/files/1/0432/0064/3236/files/67743882420.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/pekato.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004215.bin
a8ed269f59bd3146abee42e9b03af08bfd2d6a3cab215a172287d90c75bd0dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x4215 5364 bytes
font_01_sfnt_off0000543e.bin
c6ba569806dac0f88b6964732cdf2b7644055b66fc6ada3d466921957dcf62f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x543E 9856 bytes