Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbbe86f5de8f842…

MALICIOUS

PDF

40.3 KB Created: 2020-08-22 20:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d92d48986458316688b795e014e8f0 SHA-1: f28af6bdf5889590fe4491dac4d7ee1371c2634f SHA-256: bfbbe86f5de8f8429554dd8416437088521451ecc440bdd736b68f158f8aa7a3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link pointing to 'ttraff.com' which is associated with malicious activity. The document body and embedded links suggest a lure for potentially unwanted software or further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm, further supporting a malicious intent.

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=chapters+interactive+stories+mod+apk+unlimited+diamonds
    • http://files.whldesign.com/uploads/1/3/1/3/131379409/5343169.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/angiosperm_plants.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/fejetexizivimelavoxukaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/2500/4706/files/axis_bluechip_fund_portfolio.pdf
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/74482547339.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/54971027859.pdf
    • https://cdn.shopify.com/s/files/1/0439/0505/6920/files/27542920742.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/multichoice_bursary_2020_application_forms.pdf
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/17404024003.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/trastorno_ansiedad_por_separacion.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/modumorovulutatize.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_off00006217.bin
ac29c18a146d87459fff8e522a2b823bd48a8175384069279c7726316a016abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 5344 bytes
font_01_sfnt_off0000741b.bin
30ca8d7db5808e8f941350c199f3d8677365435574bb731a0c013f03c21bd969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741B 9344 bytes

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