Malicious PDF — malware analysis report

Static analysis result for SHA-256 270bf128ae63e3d2…

MALICIOUS

PDF

45.7 KB Created: 2020-08-07 09:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af849e867c6951dff3630c0815f1b9d2 SHA-1: e76f1185ebd69b4dbd3000e7e5d159a9c47b6a73 SHA-256: 270bf128ae63e3d2164727207e321611f418f77c95e9195df851b5a20b3cf9cd
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is presented within the document body, disguised as a physics textbook PDF download. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, tricking users into visiting a malicious URL.

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=physics+textbook+pdf+class+12+cbse
    • http://files.kathrynyarbrough.org/uploads/1/3/1/3/131384400/dejepadag.pdf
    • http://sewugone.guysamc.co.uk/uploads/1/3/1/0/131070450/0b79fbbe.pdf
    • http://files.musumethegame.com/uploads/1/3/1/3/131383456/jovus_mujuwa_baragerafuruw_pavedit.pdf
    • http://files.mortgageinsuranceontario.ca/uploads/1/3/1/4/131408970/ea3395081748.pdf
    • https://cdn.shopify.com/s/files/1/0447/1944/0028/files/cambridge_ielts_book_8_listening_test_3_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9304/0029/files/48791568932.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/sozaneranenafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/zunaguzuwusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/vobaxavovobusitugubu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/95837189766.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/63950671938.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/15478477074.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/67464350210.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/72659877177.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/pujozoruvujagefaveru.pdf
    • https://cdn.shopify.com/s/files/1/0430/9847/2605/files/household_budget_forms.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_off000073eb.bin
72c9eff3e88f623a40c81bf2e228860017649d6cfae38bf46a96d3ea531d2585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EB 5708 bytes
font_01_sfnt_off00008767.bin
52822f357a71ff80065cae3a68dd069894b72f7576eff0ed374254c8a56a2a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8767 10012 bytes

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