Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdee3072065acbf…

MALICIOUS

PDF

47.7 KB Created: 2020-08-27 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0663e70398f2241011d2dc9727eda910 SHA-1: ecb5b3300895508314b0d0479f46c29a8a4881c4 SHA-256: 5fdee3072065acbf718dc396efc60c581e8f2d6f2bec0eab1f418e503eb6294b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. The primary malicious URL, https://ttraff.cc/pify?keyword=ubs+numerical+reasoning+test+wso, is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'ubs numerical reasoning test', suggesting a lure for job seekers or students.

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=ubs+numerical+reasoning+test+wso
    • http://wifejobo.canadianviolasociety.com/uploads/1/3/2/6/132681352/gosurenewadutodo.pdf
    • http://mutozopiw.danawensley.com/uploads/1/3/1/6/131606457/6834412.pdf
    • http://legiziko.monticellosmarket.com/uploads/1/3/2/6/132682156/mapidefopimapafele.pdf
    • http://files.personalbaggagestyle.com/uploads/1/3/2/7/132712358/5635820.pdf
    • http://files.artsalpharetta.org/uploads/1/3/1/3/131379183/didulozuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6760/4128/files/13680997792.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/99831032231.pdf
    • https://cdn.shopify.com/s/files/1/0430/7343/7845/files/saxirulumator.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0245/files/stomatitis_aftosa_rekuren.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/vexopax.pdf
    • https://cdn.shopify.com/s/files/1/0458/0687/8886/files/does_not_masturbaiting_increase_testosterone.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/87697919269.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/jisutazedu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/connect_financial_accounting_chapter_3_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2445/files/26029460717.pdf
    • https://cdn.shopify.com/s/files/1/0464/9517/0728/files/vidmate_2017_video_er.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_off00007038.bin
92f1cab3b4500b80cae29271d8759e32db3e3998f353150d0d113ed7ed8eeaa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7038 5340 bytes
font_01_sfnt_off00008255.bin
371eaafaed65be0fa07d8c727ce1a5c1fa3099b07b583108b8e0d5786a19c55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 14984 bytes

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