Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad308ef750cd28b1…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 20:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ea21bb216e0cd55df150f73135f9bf SHA-1: 6759279d2bbd1dca492e829904473f1d913a0fde SHA-256: ad308ef750cd28b13161572ec3df53add66ad36b82f89e6afaa01da8d0e485a5
152 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, pointing to 'https://ttraff.ru/pify?keyword=fractional+indices+worksheet+with+answers'. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, many hosted on Shopify. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=fractional+indices+worksheet+with+answers
    • http://famuku.mkgcleveland.com/uploads/1/3/2/7/132740480/binojosug.pdf
    • http://xugome.bellachiengoldens.com/uploads/1/3/0/8/130814328/ea4fbf3.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/tokisofufedojisizim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/80684423665.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/benado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3931/files/abbyy_transformer_12.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/92099330149.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/sedumiteruzosusige.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52135332303.pdf
    • https://cdn.shopify.com/s/files/1/0434/9958/5696/files/tiwowomuxoted.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/fesafomen.pdf
    • https://cdn.shopify.com/s/files/1/0447/8792/5143/files/exercicios_de_atomistica.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/carlota_perez_technological_revolutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.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_off0000536c.bin
994bd5000d446ba2cd3a9ca8d104339f130f62ea2578b1dfe1ee3af1452160a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x536C 5136 bytes
font_01_sfnt_off000064e8.bin
126f894a116b7f9725f73df90905b9bcd69f319896447f86b96f596024f55ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 9748 bytes
font_02_sfnt_off00008682.bin
de76a48b03d8a68ea6e765fd7f8b30dff5909a700d3fa289395d081cc4c1bb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8682 16340 bytes

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