Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd456fcd03ad2826…

MALICIOUS

PDF

36.8 KB Created: 2020-08-05 16:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2007785f948c16bb4d702473d889ac65 SHA-1: a5732fdf32fdc7c66510b88c8651634b2abac197 SHA-256: fd456fcd03ad2826147394ad029eb19737a7d5422fc6bcd790e7afa3960e9a5b
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to a redirector service (ttraff.com) which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'the human brain coloring book pdf download' and includes the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=the+human+brain+coloring+book+pdf+download
    • http://wabozudo.meriadocbeagles.com/uploads/1/3/1/0/131070792/19497ae3a8db1.pdf
    • http://files.georgetowntexasphotographyfestival.com/uploads/1/3/1/3/131398333/fimawoxudokoto.pdf
    • http://files.bencouraged.net/uploads/1/3/1/4/131437044/nolawa.pdf
    • http://fanatux.jennadmassage.com/uploads/1/3/0/9/130969368/9241815.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/41771503327.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/minecraft_survival_games_servers.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9427/files/1150890654.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/dujejokegojuzilupa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/rodetaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0954/8188/files/gosuxajebevifenig.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/xudajopuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/3462/3643/files/gimuvunotozopa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2827/3562/files/favupaxokax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/mathematical_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2849/files/dokuxerokipikulu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004680.bin
8bc81ff9fd872c90411a3fce88ec117c80c60783360c2b04b962964813f6cd02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4680 5436 bytes
font_01_sfnt_off000058cf.bin
a4f7521b974907c3f3b871a3d8e457a7325b961e0db93454c6f3a4a0fb217815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58CF 9116 bytes
font_02_sfnt_off000077e2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E2 4324 bytes

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