Malicious PDF — malware analysis report

Static analysis result for SHA-256 691c0b3000f2d780…

MALICIOUS

PDF

50.6 KB Created: 2020-08-17 16:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b3353c03c86ad20b742ab3dffdb5e71 SHA-1: 5440e0d29a1d8ccc58ba9b24a16829fe80f2d12e SHA-256: 691c0b3000f2d780b0c965328db62cfb5208d39b308247fba7f1f7f1feecb767
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a redirector link to 'ttraff.ru'. This suggests the document is part of a link farm or SEO manipulation scheme, designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of numerous external links, including a malicious redirector, indicates a likely attempt to compromise users or manipulate search engine results.

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=format+html+file+in+vscode
    • http://jakama.futurescholarslearning.com/uploads/1/3/1/6/131636727/vofol_sonefoke_dupol_sopokejupafal.pdf
    • http://files.cruzah.com/uploads/1/3/1/3/131398059/gumuden-pamivepu-pewikiwid-zenem.pdf
    • http://files.ministryofbaby.com/uploads/1/3/1/4/131438038/zugiretoxane_lufoz_sofosadofego.pdf
    • http://files.ambersballoons.com/uploads/1/3/2/3/132303147/refole.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7405/9426/files/1899080408.pdf
    • https://cdn.shopify.com/s/files/1/0429/7824/6815/files/24157116033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85213016947.pdf
    • https://cdn.shopify.com/s/files/1/0436/6709/5705/files/factors_affecting_buyer_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/disokirobusaxiwupitefipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2478/files/36868077666.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/st-_120_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8663/files/learning_russian_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/22361637355.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006654.bin
6ac9cc41d72fa6930e40eb99a27d833f713e7ac299385df4a34ba5983c8e811d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 5276 bytes
font_01_sfnt_off00007819.bin
9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7819 2092 bytes
font_02_sfnt_off000081ba.bin
87272a1c1b19c6e95d3a4494aae493faa422955be99ca9708ed193e1fd47a413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BA 10636 bytes
font_03_sfnt_off0000a646.bin
89bb7b168b7638a9bd3bf894e45ed2757651b091ba91862f7a33c00ee4b2c15d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA646 16576 bytes

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