Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca7a0add22b58f2…

MALICIOUS

PDF

47.6 KB Created: 2020-08-07 13:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae2c890b8c8ad5a3fc91a63783a8b3af SHA-1: db4f93d2abfcc969523c9f796c9839b39c574e41 SHA-256: fca7a0add22b58f2216c7e2e54839b2bf6464e2bc49416afb6e5399e7b4a7848
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, also contains this malicious URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous links, including those pointing to Shopify domains, indicates a link farm SEO tactic to improve search engine ranking for malicious content.

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=gleichungen+l%25C3%25B6sen+%25C3%25BCbungen+klasse+7+pdf
    • http://files.chromecomputers.net/uploads/1/3/0/7/130738836/5683612.pdf
    • http://files.diversejewellers.com/uploads/1/3/1/4/131407179/jijorunigusoz.pdf
    • http://xajeki.lscodn.org/uploads/1/3/0/7/130775934/6832752.pdf
    • https://cdn.shopify.com/s/files/1/0438/8821/4171/files/download_myspace_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/6695194687.pdf
    • https://cdn.shopify.com/s/files/1/0429/6530/3455/files/wuzazemoverolu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/allen_key_bolt_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/65456550937.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/appearance_flashcards.pdf
    • https://cdn.shopify.com/s/files/1/0440/7898/9462/files/88060770900.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/zener_diode_as_voltage_regulator_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/toto_catalogue_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/56570237106.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1364/files/55403050003.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0838/files/51857869182.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_off00006f4c.bin
89a1ae3253d7e1f5f89ff6ac02cce136b1090b08261bcc1141ee0d2b00e0df45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4C 5896 bytes
font_01_sfnt_off000082ec.bin
c035d715cabc0d0f27f4d3cf6839bf2bf60fd7f6c810289467270538b22efaf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EC 14276 bytes

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