Malicious PDF — malware analysis report

Static analysis result for SHA-256 2402756ac92ee1fe…

MALICIOUS

PDF

48.8 KB Created: 2020-08-09 20:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c2a476755240e7f5bd2cca793af7e8 SHA-1: 3b01713fc082826dee578916abae14ad7864cb6c SHA-256: 2402756ac92ee1fe7f755fe662025f06989850f6ce754fdb327bb26f006e8ffd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to obscure the ultimate destination. The document body contains a URL that appears to be the primary lure, directing users to a malicious redirector.

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=akshar+publication+gpsc+books+pdf
    • http://files.globalwarmingvector.com/uploads/1/3/0/7/130776602/2418340.pdf
    • http://files.albanyrpa.com/uploads/1/3/2/7/132740552/2417919.pdf
    • http://detuv.xmomentsports.com/uploads/1/3/1/1/131164250/moniga.pdf
    • http://barirol.awakenteenleadership.net/uploads/1/3/2/6/132681670/6954362.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/vubabovebexiwizamibax.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/12728160799.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/dapetemovunezisetefuvov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/mejigutamav.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/dawivagez.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/novodebetenowuworapufanul.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/42148451612.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/80917693079.pdf
    • https://cdn.shopify.com/s/files/1/0434/0262/5178/files/58620240060.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/gixofowopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/97708265008.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/36974206381.pdf
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/birawomusoziw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/vuraxub.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/xofedejadowa.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_off00006a0c.bin
26317c7f5d4df0e4c73494da3a7bae5ab5e6c46ea7b481763a64d262caad9996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0C 5612 bytes
font_01_sfnt_off00007d16.bin
d8075ace0c4ee5a2d26192e1258759edbea4abdd1a976a7647f9ad5d6e3dfb02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D16 10428 bytes
font_02_sfnt_off0000a0d1.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D1 16164 bytes

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