Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b222e561ce9abb0…

MALICIOUS

PDF

41.8 KB Created: 2020-08-02 19:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a12b1315d8fd7c24d64fedbb0e0e9a6 SHA-1: 10a66e9f50c120be55fcc28903464e1e03f85fbf SHA-256: 4b222e561ce9abb0fb48e31a712f66fff24ba1e0b353abfdfb5b4ab80a321c77
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a link farm hosted on Shopify, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'printable ged practice test pdf' and the redirector URL itself, suggesting a lure to trick users into clicking malicious links. The ML classifier 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=printable+ged+practice+test+pdf
    • http://files.artfullyyours95.com/uploads/1/3/2/6/132695438/modomati_vakozul_vujirifagojeba_jowifodurozub.pdf
    • http://files.eleanorandevan.com/uploads/1/3/0/7/130776712/zozajefotoxuxib-lawek-gamepefovumin.pdf
    • http://files.lovemyhealthybeginnings.com/uploads/1/3/2/7/132740343/gaziwiviniladaj.pdf
    • http://files.beyondtheedgeinstitute.com/uploads/1/3/0/7/130739951/738441.pdf
    • http://files.foschia.net/uploads/1/3/0/9/130969294/7236485.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/gufasexebamazaduveditu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/fesufudanagogotufera.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/robatuvu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/zonowuzimaforuzavajexumo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5045/files/59214603456.pdf
    • https://cdn.shopify.com/s/files/1/0440/5529/8213/files/similokukabamalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/mumulorekute.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26450283228.pdf
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/19371711794.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/xurobamavedabatotelofegex.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/lujusovekolopulopoporab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/nimelaxanos.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_off00006373.bin
90c04fd4dc7fe8f1cab49f6c811ba1c7aa065931627179b05851113414363461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6373 5464 bytes
font_01_sfnt_off00007610.bin
b3acb539b200c7df9f00dfa973b9f1dab51b3a68f4605386086860d90b7c19d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 10496 bytes

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