Malicious PDF — malware analysis report

Static analysis result for SHA-256 0139213de83a0b3f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-02 22:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5081951a1002dc66c146390a12a5c96 SHA-1: 15dda16f10c52fb0cf09694589c024f317bd0b9c SHA-256: 0139213de83a0b3f69ef731c9f7e3dcd1c133056f8cd2a43df0e67fafb801a41
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is characteristic of SEO poisoning or link farm abuse. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=sister+location+map'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable binary data, but the link farm and redirector are sufficient indicators of malicious intent.

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=sister+location+map
    • http://files.cefcolumbiamidlands.org/uploads/1/3/0/9/130969169/gofozubigik.pdf
    • http://totos.worldtraveljunkies.com/uploads/1/3/2/3/132303338/e919b7.pdf
    • http://files.saritzahernandez.com/uploads/1/3/0/7/130776363/jusoxor.pdf
    • http://files.rcoathletics.com/uploads/1/3/0/8/130814907/zuvitebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/lakotolabukixivawipeboz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/juboguje.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4366/files/19168800646.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50971407729.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/paxajemoxisibofaraxapow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/lagededuxoga.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7655/files/musajojirir.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/gozewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/veluzilapokotexejizozozow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/wakezorene.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/lufenowarivo.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_off00006d67.bin
3034f4b2f0c27e7ba4fde905eafd189470a72b00b49c92f80892cbc32d5fa251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D67 5180 bytes
font_01_sfnt_off00007ef0.bin
85baba640ce17c5670f04f83ec57c3e19a3b4699fd0c8c40477d270e24046480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 10484 bytes

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