Malicious PDF — malware analysis report

Static analysis result for SHA-256 0116416c28fde1f4…

MALICIOUS

PDF

35.4 KB Created: 2020-08-08 14:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b1f27ce918f22f74fc231995bdf880 SHA-1: 180563d5a5d697c982a533f64c0797921063671d SHA-256: 0116416c28fde1f4dd11fd535a14a806069644a0719e5b039ce4ca56c2e66995
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'Casio fx 991ex classwiz manual pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also 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=casio+fx+991ex+classwiz+manual+pdf
    • http://files.sbcovoad.org/uploads/1/3/2/6/132695553/7465373.pdf
    • http://files.rexforddrive.com/uploads/1/3/0/8/130813732/d93f701ec22.pdf
    • http://files.samsysgroup.com.au/uploads/1/3/0/7/130776462/dabotafovanogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/jojerudipululozetejuketa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/xadovaboxebedovelemafuvup.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/xazibofulor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47948794002.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/ielts_academic_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/actionable_agile_metrics_for_predictability_an_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0430/9935/7338/files/film_production_company_business_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/6195/3191/files/87296055281.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/vesadalizexekikut.pdf
    • https://cdn.shopify.com/s/files/1/0435/7298/6015/files/lefopebesusujilukijewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/topus.pdf
    • https://cdn.shopify.com/s/files/1/0429/1752/7715/files/morajivifanoruxebovu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/monuwivotajenuvi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d5a.bin
0a4b6a614febbeca3dcd903b1e5aebd28443a5f46f01664efb2917ba2e2d0a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5A 5528 bytes
font_01_sfnt_off0000603a.bin
b2aef448b63a74f7ed5e8b05de3e02b01aa7b2217e3b43cf2a0cf5dd05b0678e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x603A 9492 bytes

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