Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa46b749c701760…

MALICIOUS

PDF

44.3 KB Created: 2020-08-01 12:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a9f6c528f76727825bfd9aff6a110d SHA-1: 6bf28f0fafe5ac6c75fb65ebf22da1916ea1720c SHA-256: baa46b749c7017608c2b1b91f12b684982a3615f9fc2452f1a791cf245f848b5
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.com' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Old yeller study guide pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.com/pify?keyword=old+yeller+study+guide+pdf
    • http://files.budrejko.org/uploads/1/3/1/3/131379591/bulidiju.pdf
    • http://files.joannakalliches.com/uploads/1/3/2/7/132740278/eec37017f4b07a.pdf
    • http://files.thewomensshed.org/uploads/1/3/2/6/132680908/guzejifolaro-nobadofibibo-reniwujufokokuj-wusikunudixoja.pdf
    • http://files.phasephotonics.com/uploads/1/3/0/7/130739024/8f3f2b35a036.pdf
    • http://files.libertyeliasmiller.com/uploads/1/3/2/8/132816066/9e9976787.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/66648846333.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/1425894273.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/soxegokabemigotuxekig.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/pugolujofibuguzewaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0437/4285/5319/files/9927859606.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21617342462.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/sarawiloxowaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/32229490053.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/venezuparexobipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ee.bin
734c45b25ff5f8c317222428ddcc973fa7b8786782ac13a10867d056dad661e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 5128 bytes
font_01_sfnt_off00007673.bin
85e66e3a5a59699a931d767825b6a53282803caa5391332371456bac4115df59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7673 2576 bytes
font_02_sfnt_off00008032.bin
47fb66752a6bc29184bab111bf434a0c8d46e314c0c089e125efd19080e576fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 9956 bytes

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