Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1274fd9a6d7634…

MALICIOUS

PDF

60.2 KB Created: 2020-08-08 16:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e5a35e746e5952b7a77f0490252e03 SHA-1: bc31a6a9c968d469ed0e3d3d6375a76e6e0d2263 SHA-256: 3c1274fd9a6d7634a1ba2a048b032886026abaeb2b22b70a4074f55913aa6dd2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at `https://ttraff.cc/wb?keyword=measurement%20of%20air%20temperature%20pdf`. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier strongly supports this assessment.

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=measurement%20of%20air%20temperature%20pdf
    • http://files.oxfordpard.com/uploads/1/3/0/8/130813645/wapox_lesunubomo_bepem.pdf
    • http://files.beckedout.com/uploads/1/3/0/8/130813094/dezigakisetud_senefexaribugob_soburekemavaje_totakenijowo.pdf
    • http://files.adolescentidentities.com/uploads/1/3/1/3/131398598/3525293.pdf
    • http://bozepez.goodwinbiotechnology.com/uploads/1/3/1/4/131406893/nibisezinuwulomuli.pdf
    • http://files.merrimacohd.com/uploads/1/3/1/8/131872238/vemefelex-xezevinuwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/naputemotezesudidabumika.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/grade_5_math_practice_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/0693/3661/files/a_ladder_to_the_sky_john_boyne.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/27645571236.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/el_dulce_dao_alfonsina_storni.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/38542822256.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/kosatemenexuferibevew.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/65632700565.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2014/files/dazuwikisojivefikawetilof.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1374/files/5977238397.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b6b.bin
0280b51ad3e4429f5468a79a555ac037193641df827c7fccb49741d71f8fd000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 5044 bytes
font_01_sfnt_off00009c77.bin
500621d5f534c563f67fea497d705736a129ff9b824811277fc9bea4599d011f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C77 10644 bytes
font_02_sfnt_off0000c0ce.bin
0b6d67ed6f7b9ca340f69bc1efbee2cf1faeb02ae856abbfc241c325d1d7b232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 16064 bytes
font_03_sfnt_off0000d563.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 4324 bytes

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