Malicious PDF — malware analysis report

Static analysis result for SHA-256 488083f34403c81d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-13 19:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9c57be67669a37f4da4f3907a2ec84 SHA-1: 037f2dc3dde9f44503a48e98dc9aa9086e18a121 SHA-256: 488083f34403c81d2e0766fbf514c3f32d93b799cb73925c1991b464cca4b9e4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=english%20jurisprudence%20mcqs%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the first being 'https://cdn.shopify.com/s/files/1/0429/2853/7753/files/vodasuluzukamulud.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the 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.cc/wb?keyword=english%20jurisprudence%20mcqs%20pdf
    • http://files.jimpendergrass.com/uploads/1/3/2/8/132815961/xabixejeje-nenowapiwage-jisematonalon.pdf
    • http://files.mrdavolatech.com/uploads/1/3/1/8/131872295/6725142.pdf
    • http://gikonal.massillontigerinstructionalresources.com/uploads/1/3/1/3/131384284/2060991.pdf
    • http://vaniruro.jalbrightclassroom.com/uploads/1/3/1/4/131407469/7543187.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/vodasuluzukamulud.pdf
    • https://cdn.shopify.com/s/files/1/0429/1965/7628/files/kinobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/72859422527.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32600433864.pdf
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/27582237903.pdf
    • https://cdn.shopify.com/s/files/1/0433/1480/6937/files/boxuwet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/4139694168.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7030/files/48822479904.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/3302906563.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/ed_and_ing_adjectives_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0432/4887/7736/files/tatalaksana_diare_pada_bayi.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_off00005cf7.bin
52a03909624d417be590745de661a892a1bb7caab71faf34081a56b8a7233be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF7 5208 bytes
font_01_sfnt_off00006e74.bin
c8ea15f0c3620da3f24b90b5f3ae53c011b40712544ff361eff32771505a141c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E74 10532 bytes
font_02_sfnt_off0000922c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x922C 4324 bytes

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