Malicious PDF — malware analysis report

Static analysis result for SHA-256 966b9665b8b6698e…

MALICIOUS

PDF

43.9 KB Created: 2020-08-19 11:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3557a45db4864e60f4be7a1df15a1872 SHA-1: c2523acb5bca8d8d72490da1f58e61d2a22d46bc SHA-256: 966b9665b8b6698e6e41ad6f9c54d207008f6d973cb37efc60f629a0945bea1d
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=astrology+answers+daily+horoscope+aquarius'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lure users to harmful content.

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=astrology+answers+daily+horoscope+aquarius
    • http://files.ballicocressey.com/uploads/1/3/1/8/131856987/eff40bf67f99a.pdf
    • http://files.swords-dublin.com/uploads/1/3/0/7/130740141/tolozezeja.pdf
    • http://files.ladamedustlaurent.com/uploads/1/3/0/7/130775743/7555744.pdf
    • http://daninin.belfordcashmere.com/uploads/1/3/2/3/132302780/6430768.pdf
    • http://files.studioappalachia.com/uploads/1/3/2/6/132681823/mofikow.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/xupefagamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0725/files/capitalist_realism_mark_fisher.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/81887288334.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/vejurijomegame.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5579/files/11257781892.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/pupotelexelid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/84878062051.pdf
    • https://cdn.shopify.com/s/files/1/0432/7876/2140/files/osama_bin_laden_images.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/62809261201.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/94955862806.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/android_rpg_games_best_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/engineering_drawing_notes_for_rrb_alp.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_off00006a66.bin
6a45722b9b9ecb1f8a07234e6c2fa5819cae54464b83567d87a4d8cb76c41c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A66 5644 bytes
font_01_sfnt_off00007d9a.bin
1113cd804787811e4af822e09418cdff09f36c2088e7ea2f22e2f3e23f08a9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9A 11136 bytes

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