Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1750a65f6a51c7…

MALICIOUS

PDF

57.2 KB Created: 2020-08-09 19:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2db9e9e8d65999939caffe30aaa524b SHA-1: 7806a2db4984d5cbc56247fb81f6305b939f2110 SHA-256: 2a1750a65f6a51c7dc798b5af3f00b2c7f2b207868fb3a80a50094f0979b7160
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=manual+completo+de+aberturas+de+xadrez+pdf'. This URL is presented within the document body, disguised as a chess opening manual, to entice users to click. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector is sufficient to classify the attack pattern.

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=manual+completo+de+aberturas+de+xadrez+pdf
    • http://files.equityallies.org/uploads/1/3/1/4/131408572/3522063.pdf
    • http://files.melbournegallbladdercentre.com.au/uploads/1/3/1/3/131382274/paxetifupekiz-vunimibutaviju.pdf
    • http://fomixad.viholisticnutrition.net/uploads/1/3/1/6/131636725/tebawamox_busepi_joxuminanib.pdf
    • http://files.fijifreshkava.com/uploads/1/3/2/8/132816066/62df9b0ea6045ff.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/ielts_general_speaking_samples_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/vimivejaguzudukuxiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/atresia_duodenal_clasificacion.pdf
    • https://cdn.shopify.com/s/files/1/0436/7345/2697/files/ufc_3_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/alphabet_letter_tracing.pdf
    • https://cdn.shopify.com/s/files/1/0446/7389/2515/files/blood_pressure_chart_by_age.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/pezisel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/xisebakud.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4890/files/98028593379.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/30775416187.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/ziwazanepobufonawu.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_off0000a0d6.bin
eb81a5c6fbf572e63e17cb6cc3bd56b48c97030254df8da7b810b02ba0ac7c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D6 5564 bytes
font_01_sfnt_off0000b3c0.bin
0cda0f354eaab7e7f91c61ef67f45185fdc09c4c4de22f40731968590e742bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C0 10904 bytes

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