Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a81b35bf86c96f3…

MALICIOUS

PDF

61.2 KB Created: 2020-08-19 23:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7492b72616b9e8af71270d4581b342 SHA-1: ece1669caa884878a0acdad532209c7666c9fa63 SHA-256: 4a81b35bf86c96f374dd19e9a5db6acde8a598e6a631fc3569743389d7693a4a
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'new assamese video', and the embedded URL `https://ttraff.com/pify?keyword=new+assamese+video++asomi.+in+2019` reinforces this. The presence of a large number of external PDF links also suggests a link farm or SEO manipulation tactic. No scripts were extracted from this sample.

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=new+assamese+video++asomi.+in+2019
    • http://files.martagonzalezaregall.com/uploads/1/3/1/3/131378899/vitofuxe.pdf
    • http://files.georgetimmermans.com/uploads/1/3/1/3/131397946/7701400.pdf
    • http://files.hole-group.com/uploads/1/3/1/1/131163752/7d8550cc88.pdf
    • http://buxago.bodymoksha.com/uploads/1/3/1/6/131606457/buzuluxikomemid.pdf
    • http://vegavat.companionsnotlivestock.org/uploads/1/3/1/8/131856023/88e371839630.pdf
    • http://files.martagonzalezaregall
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/28245873175.pdf
    • https://cdn.shopify.com/s/files/1/0431/3517/2770/files/kewagalekoroxusoratuniti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/fusoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/45561569764.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/69278496508.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/order_of_adjectives_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/lagovojakoramexudaribowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/55871767057.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/bukuvawazujolub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/cracker_barrel_menu_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2645/files/davesabepuxezagewewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/feduto.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ec6.bin
d7e13b19eeb2bf64cbc4c03681e68bc0c545647d364376bcbe5bdd036083a1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC6 5476 bytes
font_01_sfnt_off00008178.bin
1d1b47621eb6f31e71dd6693f2302fdb82fc888d5af9312e1218a1409b44640f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 5344 bytes
font_02_sfnt_off000092f7.bin
e2e6dae3d0fead58e79b290b818da1656cbc97c7e4c6662bcb3b73e747107d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F7 8276 bytes
font_03_sfnt_off0000a94d.bin
89cc54bf347163a7a1c79b6f17998cdab7699b1231688ed1ed9e646472b67e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA94D 10976 bytes
font_04_sfnt_off0000cee4.bin
aaf572d00a855f20815910e8c1d6548a5f51f75b4536b7d0b60e8fd90f939201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 16216 bytes

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