Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa12a56e001fe66…

MALICIOUS

PDF

33.4 KB Created: 2020-08-09 20:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa7009398df15f91c58720bfb8b54b75 SHA-1: 624b593ee2393ed348ce0cf28533eb278eb6ed85 SHA-256: dfa12a56e001fe6693062ff57efac3df9dc80e5693f5d9c144a016c5ce9b7216
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=nelson+math+workbook+answers+grade+6+pdf'. This URL is likely used to redirect the user to a phishing page or a malware download site. The document also contains a large number of embedded links, many pointing to Shopify, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=nelson+math+workbook+answers+grade+6+pdf
    • http://files.delibythebeach.com/uploads/1/3/1/4/131407152/bogujip.pdf
    • http://befewa.thedojoparamus.com/uploads/1/3/1/4/131407558/wubemu.pdf
    • http://files.imitolab.org/uploads/1/3/2/6/132680926/tunefenitegije-jewaxokefux-durugamugeriwir-wafaxokanokova.pdf
    • http://files.freeshipcbd.com/uploads/1/3/0/8/130874025/4856405.pdf
    • http://school.nelson.com/mathfocus/grade5/otr/pr
    • https://cdn.shopify.com/s/files/1/0428/9216/5279/files/fiberojuzijagitomakuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1220/9315/files/git_pull_master_into_branch.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/18638307620.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6509/files/natexijopebeses.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/56305714525.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/south_african_food_based_dietary_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/37478421063.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5423/files/85359603429.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/zosukas.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_off000043eb.bin
18fdfa5c8bc9fa18f3a10c76f6e272f012dbdccf95cef51fe4353de956073a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43EB 5876 bytes
font_01_sfnt_off000057cc.bin
c5dacfe205b01b81af43dbe84cc3796ea9b21e6cd957cae3657776e84ddb82a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CC 9952 bytes

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