Malicious PDF — malware analysis report

Static analysis result for SHA-256 841019b9df9bc4d0…

MALICIOUS

PDF

55.5 KB Created: 2020-08-06 05:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 901bd97459cc70a22ff4ed8ea40656f5 SHA-1: c5237ebafcdfd661721cccc718354bc7f0c13e23 SHA-256: 841019b9df9bc4d036ab518704c0d7f1e35063e5605f44ab7a3fd3aaa0958502
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=the+time+machine+penguin+readers+level+4+pdf. This indicates an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL and numerous other links, suggesting a link farm or phishing lure. The ML classifier also 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.cc/pify?keyword=the+time+machine+penguin+readers+level+4+pdf
    • http://files.rathfrilandmotorclub.co.uk/uploads/1/3/2/3/132302913/zomawuzivoludi_petusol_mufawukemur_xitedelufukojob.pdf
    • http://puvuraje.citadelhomeinspections.ca/uploads/1/3/1/4/131408738/4088736.pdf
    • http://files.dkgalphachapter.com/uploads/1/3/1/4/131482887/nefof_difojokemeforer_jivuxaduzapaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/zavot.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/residential_landscape_architecture_6th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9408/8616/files/circle_with_dot_in_middle.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2633/files/6927387391.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/fegobajiga.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/agreement_letter.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0437/6041/8970/files/95732386266.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/curso_de_violo_intermediario.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/62116242183.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/60463060325.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_off00007fdd.bin
7c50d17a9ee9280c80da86fa8faac31da617649274ed50772b0c7d92e266e6a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDD 5664 bytes
font_01_sfnt_off00009303.bin
936c990f14c4e503d6c4bedc8e6905416cc904844af46e8313172deffc9b1125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9303 10772 bytes
font_02_sfnt_off0000b7e9.bin
3d569202a327060c188859987a1d4b8185c78b00fe686aaf0eeda8bdc2ce2657		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 17132 bytes

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