Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa7b489d5cbb1e7…

MALICIOUS

PDF

41.1 KB Created: 2020-08-03 19:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f47009fab9eac41708bb74eb1bd87f6 SHA-1: c74ccfa86009c8a01ad9e2b8d96448f8a943bf1d SHA-256: 6aa7b489d5cbb1e7b108efd6ef32c60137d0cca58e212f08b3a64f46ec8b9939
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate PDF resources but redirect to a known malicious URL (ttraff.ru). This technique is commonly used to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms this assessment.

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=fisiopatologia+do+cancer+de+colo+de+utero+pdf
    • http://files.ememathshub.org/uploads/1/3/0/7/130775786/5799797.pdf
    • http://files.davidbeagin.com/uploads/1/3/0/8/130814043/vuwumigijomamo_defurog_kurel.pdf
    • http://files.johnandkarahood.com/uploads/1/3/0/9/130968996/2863726.pdf
    • http://files.blackstoneheadwaterscoalition.org/uploads/1/3/0/9/130969306/fe7114350aaa3.pdf
    • http://files.cyclingadventures.net/uploads/1/3/2/6/132695689/sulexovabub_bubizelogu_mekodovi_pinuvawenun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/revenant_dragon_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/faxezis.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/datotezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/59434867252.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/71956120454.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/30453749886.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sagomowaroperovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/rovozerafixomeri.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/47038885649.pdf
    • https://cdn.shopify.com/s/files/1/0438/5928/0022/files/muxiputodewesusine.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/21538099178.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/9464588538.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/44588991213.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_off000062ba.bin
59b3e8afec67a8da6e3ff686e9904721531b9f86035e7f7e5c9cdf8da763569b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 5276 bytes
font_01_sfnt_off000074bc.bin
bf5c6ed214c883d3fb9f784f0bdd4a02e71ee5b5a2588e5d8bbd590065ea7ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 10160 bytes

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