Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa4c82a9023c1ca…

MALICIOUS

PDF

45.5 KB Created: 2020-08-13 00:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cac166ed4175913d3c14795530482f82 SHA-1: 819b76a784b42f1f7ba735f7f998d60cd80425f3 SHA-256: 4aa4c82a9023c1ca38d4b7331f7219c442d8880d7e1e437186ffa4393b3efa67
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

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, contains text related to academic performance and includes the malicious URL, suggesting a lure to trick users into clicking on the links. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=academic+performance+of+students+with+hearing+impairment+pdf
    • http://deripexez.triplejackproductions.com/uploads/1/3/1/3/131383314/torax.pdf
    • http://files.somebodyelsesjournal.com/uploads/1/3/0/9/130969371/siwefubitore.pdf
    • http://pitife.christopherbelser.com/uploads/1/3/1/3/131380213/3060220.pdf
    • http://mupepubu.perthdressageclub.com/uploads/1/3/1/3/131381204/e67de4.pdf
    • http://files.learningforcharity.ca/uploads/1/3/1/4/131452735/3011405.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/90331297137.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/zabebatoveku.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/17946767358.pdf
    • https://cdn.shopify.com/s/files/1/0436/6857/0265/files/reaktionsgleichungen_aufstellen_bungen_mit_lsungen_klasse_9.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/wufuxemenapabokuxuludijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/latuwavexixasexibirapa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6285/files/99217946021.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/renexonumokadinuji.pdf
    • https://cdn.shopify.com/s/files/1/0448/0257/2437/files/ichigo_final_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/the_astronomy_book_dk_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/definition_of_society_in_sociology.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/16275129536.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/51026364140.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_off00007273.bin
1f0cbe443c4e32f3de0b73bbd326dbbed523b5249170b9d279f0332df18670ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7273 5616 bytes
font_01_sfnt_off0000856d.bin
b738e414f634604a5b86f81ce3b10ecf8188f02ba614649ee33fdf5d49c02c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856D 10300 bytes

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