Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c99dd3bda91ef1b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-20 02:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb5170a5cd7881a35c86b050d5455c4 SHA-1: e55bc7f99a2616a9b63d8a02a2936ea21c274175 SHA-256: 8c99dd3bda91ef1b23dcf8fb1d9a3e3d03d843ca3a7814cfe08afe84ccbd0bbc
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate that this PDF is part of a link farm, likely intended for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=chemguide+dehydration+alcohols
    • http://nevis.manchesterctpal.org/uploads/1/3/1/6/131607600/tizoruwagum.pdf
    • http://files.speakingofveganfood.com/uploads/1/3/2/7/132711999/9796.pdf
    • http://files.mystartjournal.com/uploads/1/3/1/6/131637136/sepazejituled-gewopi-zazipolajum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/screen_record_mac_with_audio.pdf
    • https://cdn.shopify.com/s/files/1/0454/0373/4184/files/cambridge_primary_english_activity_book_stage_6_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/norigoxupivifenel.pdf
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/mulabuziremepos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/standard_bolt_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/zedewidikefupezemilon.pdf
    • https://cdn.shopify.com/s/files/1/0437/3741/5831/files/wazuvovewe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3000/2336/files/12240090116.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/2nd_edition_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3209/1546/files/add_text_to_google_chrome.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_off00005ff6.bin
738c080d5545e632eac09cc87b0d81987abf90f24ea641560c27468a17976c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 5360 bytes
font_01_sfnt_off0000720f.bin
8d6051387e9e746443dbe7a7f1de4f1c1778be435a48b652bc836bc3b959dc05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720F 9940 bytes

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