Malicious PDF — malware analysis report

Static analysis result for SHA-256 a695d67925b3a455…

MALICIOUS

PDF

91.4 KB Created: 2020-08-12 22:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4d20874527642a925bc350c16574b8 SHA-1: 575b3e2c3b86a521136a5072bc7851ec8c77a5e1 SHA-256: a695d67925b3a455760a37f823bb7d0753b13038769c1d69ad0c66acaceef47a
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=malaria+pathogenesis+pdf', confirms this redirection behavior. The ML classifier 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.cc/pify?keyword=malaria+pathogenesis+pdf
    • http://files.sakonnetlighthouse.org/uploads/1/3/1/3/131383358/xasumodan_bulitiduwo_naxejebepasama_gilatof.pdf
    • http://files.clarygarden.org/uploads/1/3/0/8/130814926/5649465.pdf
    • http://files.cynthiabjorn.com/uploads/1/3/0/8/130814636/sumujexotisexipavora.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/xezipalelazogixizeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/35227634632.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/clicker_heroes_coin_hack.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5224/files/batman_hush_comic_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/fenunadunotoxepagowuwenij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/69623382572.pdf
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/jijazapanijipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/concept_of_validity_and_reliability_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/sasunusemipazarisefeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/23882122464.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3557/files/wikonopimanuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/32055199109.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/suniwaremalawopafemunu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/59192495648.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_off00011bc9.bin
d3cb5d83aca1a34ac133c78684f3badd8d6a40fa9a22c2c31b6df49a813c58a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 5096 bytes
font_01_sfnt_off00012d17.bin
c6478372459a57e4bdf41a48a3dfaac05549c0b38031c91ffd09fd43d1666706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 11000 bytes
font_02_sfnt_off000151ea.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151EA 4324 bytes

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