Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e989aad0410b794…

MALICIOUS

PDF

41.3 KB Created: 2020-08-23 11:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbaef9396bc512f05303e19692fd8413 SHA-1: 8386794402eb5f4cf054d8b7b9ce014a76baca1e SHA-256: 2e989aad0410b79466636cff01c8bbd341902dbfc174bbc7aabe8824579ec5f8
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing indicating a link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'add and subtract unlike fractions worksheet pdf' and the malicious URL, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious site disguised as a legitimate download.

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=add+and+subtract+unlike+fractions+worksheet+pdf
    • http://files.thebigimportantfoodblog.com/uploads/1/3/1/4/131406629/ceba5bc479.pdf
    • http://gubojefet.photocardsbymargaret.com/uploads/1/3/0/7/130775376/furotozuvale.pdf
    • http://files.stevedurow.com/uploads/1/3/1/4/131437418/gelopezidab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/28844821434.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/color_blindness_test_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/jirinarelafes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/98737672565.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/vesimuwudosu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/lerafikiditazagizubojodul.pdf
    • https://cdn.shopify.com/s/files/1/0464/6404/1118/files/12389528844.pdf
    • https://cdn.shopify.com/s/files/1/0432/3904/7336/files/kemirusijekujopaputuwef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/74348928141.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/84887058553.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/chaotic_sword_god.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/aristotle_poetics_tragedy_six_elements.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_off00006476.bin
70d8e67aec7eea580054acf2c94ba3b6dafa1c0be4e3da7c0670fa8caf5f7cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6476 5528 bytes
font_01_sfnt_off00007741.bin
2cbf80ccadf42d19b3009b5ae8ff7293e8e7d9ee4b4d4520a7fa053ff4362354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7741 9720 bytes

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