Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b09bb545049dca7…

MALICIOUS

PDF

33.7 KB Created: 2020-09-08 06:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05e0a59600c14bfbcb58f0cbc9f1dcc SHA-1: 534a5ef203d635c95bf311926c654f239ca8676b SHA-256: 3b09bb545049dca75ed66d9b1f96520ab59828fcb99aba66f2d22c9e38e51aea
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.me'. The document body, though heavily obfuscated, appears to contain the same URL and other benign-looking URLs, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=polar+express+theme+song+piano+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_5915ebbfb8bb455f8e6a356e97e78d53.pdf
    • https://static.usrfiles.com/ugd/67e251_b3ceb29d5a994e8fa4621a417203a440.pdf
    • https://static.usrfiles.com/ugd/510a18_98463653911a456eba358b314c159847.pdf
    • https://static.usrfiles.com/ugd/03ae60_34a08e6883ee43e4b4305cdc0dbd63c9.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4443/files/9086325041.pdf
    • https://cdn.shopify.com/s/files/1/0460/1557/8279/files/dibuxibalipojapomomumu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/nasefidosugasux.pdf
    • https://cdn.shopify.com/s/files/1/0441/0998/7992/files/96752719856.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3521/files/32624642768.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/zudejazajakuj.pdf
    • https://cdn.shopify.com/s/files/1/0458/6120/8217/files/arpan_film_ka_gana_video.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/arma_3_lakeside_life.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/vubitoxezozenosow.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/kunut.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/gebef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/blood_relation_questions_ibps_guide.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_off00004706.bin
08c034c2f18fddd18760a76ec19b77da4d9515868de845b1bcb4864fe81d1e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x4706 5416 bytes
font_01_sfnt_off00005955.bin
4beb25317ed9bf8289c6d77b85ebcbd28d47228f6cdec61aee382deb3aea7578
pdf-font-stream PDF embedded font (sfnt) at offset 0x5955 9404 bytes