Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db0e4e4116fc554…

MALICIOUS

PDF

47.5 KB Created: 2020-08-16 18:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e1a075a97d315a4310a4e771959cbc SHA-1: 5673eab70dccee0026a3363af55b5bfbd225680d SHA-256: 4db0e4e4116fc5545a7d76587c7e96dcff706a2a56dc868397f969baef18e783
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL 'https://ttraff.ru/pify?keyword=anxiety+signs+and+symptoms+pdf' is a primary indicator of this malicious redirection. The document body, though heavily obfuscated, contains this URL and numerous other PDF links, suggesting a social engineering lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=anxiety+signs+and+symptoms+pdf
    • http://files.lochgoin.com/uploads/1/3/1/6/131607239/gutexal.pdf
    • http://files.bridgeportrodandgunny.com/uploads/1/3/2/6/132681634/kujez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/86841271288.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4738/files/sugejos.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/bokufokovujasezopoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/raboxexovogesenijutekom.pdf
    • https://cdn.shopify.com/s/files/1/0429/1539/7788/files/stanford_essay_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/2955/3575/files/85310029375.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/economic_structural_adjustment_programme_in_zimbabwe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/top_100_ps2_games.pdf
    • https://cdn.shopify.com/s/files/1/0438/3725/9936/files/aadhaar_card_form_assam.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/fibavilobigabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8358/files/taduluwu.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_off00007bc2.bin
0d7b74c4fa9e1a2897e6e9d227a76e56cc390df54c89e4810ae0700f4ab453c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC2 5392 bytes
font_01_sfnt_off00008e16.bin
022788b9605602bf2f223e4faced9ad92c5907a46223c4833361f9e9df33459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E16 10208 bytes

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