Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3868a5a51d8e52…

MALICIOUS

PDF

43.4 KB Created: 2020-09-18 16:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b731815dc712a1528b843d9e4ae8409 SHA-1: 4d5329fc1787d5bbe0adba845f2ebe9c53c9be21 SHA-256: 5f3868a5a51d8e52cb7c21d633083c6297d049432188fa143eb15d7c5a20200a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.me/wix?keyword=east+central+university+conference', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign, aiming to lure users to malicious infrastructure. 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.me/wix?keyword=east+central+university+conference
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/music_player_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/cloudformation_template_for_lambda_function.pdf
    • https://cdn.shopify.com/s/files/1/0463/2441/6674/files/tesebiwaxozope.pdf
    • https://cdn.shopify.com/s/files/1/0437/2273/5765/files/free_download_sb_game_hacker_apk_for_android.pdf
    • https://5d361822-1bc7-4c19-8d60-3177089158b4.filesusr.com/ugd/6350c7_eacc1aa948c24bccab153166ec7a96af.pdf?index=true
    • https://72940131-4530-4cb6-a08f-6c5ef4256cf3.filesusr.com/ugd/03f576_ed2ab647e38f49a7904340ee5488c65d.pdf?index=true
    • https://74fc0767-419f-43d2-bdcc-1038f3417f5d.filesusr.com/ugd/89064d_b841c114afda449da180999e59824cd9.pdf?index=true
    • https://d1ab69ec-4df3-4b52-b304-26269035cecb.filesusr.com/ugd/409ca8_33d8c12ad47b472e97c4b0d5ec765ffa.pdf?index=true
    • https://477a196c-33b3-4c88-8113-f1675994a855.filesusr.com/ugd/2c7c49_b5f1bac581404d95ad7ae63857b1e57e.pdf?index=true
    • https://9fde5e3f-0254-413a-b659-e919220b25d7.filesusr.com/ugd/c33cdb_5cd9fe8e387d44c0abd9e5aad2a2ff70.pdf?index=true
    • https://71e84e48-e037-4ac3-9dce-88a81e9444b4.filesusr.com/ugd/756799_53563b8857914a0ba2a678597a06ed31.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/6628/4439/files/pubg_battlegrounds_license_key_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/astm_b117_07.pdf
    • https://cdn.shopify.com/s/files/1/0428/1047/4663/files/banana_boat_sport_performance_review.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/boleslaw_prus_the_doll.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ba0.bin
e80571af13851430d1a20a6a88f5e3a02d58ef1b6a25da1efcd3c79b4d3f46c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA0 4996 bytes
font_01_sfnt_off00007cc1.bin
1efeb3ef8e4b76a662c04cda6bf5990a6023874aafa6b307eeec46393d1cf47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC1 10388 bytes

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