Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9d04c96a6841f7…

MALICIOUS

PDF

67.5 KB Created: 2020-08-11 21:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb5ac771977291b0740851a1c51ffc2 SHA-1: 6753fd977346cc01ebfcacc68c48d62d1e65b2fe SHA-256: 5e9d04c96a6841f77104d691773d587f4ad91d801c4577f36083348891f6eb27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are part of a link farm designed to manipulate search engine results. One prominent URL, https://ttraff.ru/pify?keyword=light+reflection+and+refraction+class+10+worksheets+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to educational topics, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=light+reflection+and+refraction+class+10+worksheets+pdf
    • http://delabexo.glaciertwinsbaseball.org/uploads/1/3/1/4/131409090/441332d98.pdf
    • http://zupegop.everythingalcoholink.com/uploads/1/3/1/4/131438667/gupajer.pdf
    • http://files.morristownsurgery.com/uploads/1/3/0/7/130775309/4738539.pdf
    • http://tevetaje.wordsoundguide.com/uploads/1/3/2/6/132681670/1903420.pdf
    • http://files.synopticroots.org/uploads/1/3/2/6/132695738/8010476.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/12629270033.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/multivariate_statistics_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6820/2901/files/41197425987.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9164/files/12801033896.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/fabozodepeteni.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/waninozibagasokut.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7122/files/61174507220.pdf
    • https://cdn.shopify.com/s/files/1/0434/2064/7576/files/audioslave_be_yourself_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/latex_in_markdown.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/11th_chemistry_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/23397884101.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2fe.bin
1367c38db72e1d80ab9f4107102aa4a6588f07d5c45e3c01e1bebc273f872470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 5708 bytes
font_01_sfnt_off0000c680.bin
6b7af96b45702aa43ffaf6f3a0fde3e9b94e3f3798aa9479dabb1c37b5c4a7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 10760 bytes
font_02_sfnt_off0000eb40.bin
24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 16072 bytes

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