Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc37fe5a4801d0f…

MALICIOUS

PDF

51.5 KB Created: 2020-08-01 02:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd0413ede590f5f57f1bed2a817c73e SHA-1: 97862911a723fec5a1a5bf14306700faa8b102bb SHA-256: 8bc37fe5a4801d0f20b74ae2fa9547ffdd06d8a066ea7e2df178bb24272cabff
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is a common technique for phishing and malware distribution. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the redirector URL and other URLs that appear to be part of a link farm, likely intended to improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL.

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.com/pify?keyword=structural+analysis+hibbeler+7th+edition+pdf
    • http://files.foxxfitnessprogram.com/uploads/1/3/1/3/131397987/3bb27a2ac11f.pdf
    • http://files.educationsymposium2019.com/uploads/1/3/0/7/130776401/zovad.pdf
    • http://files.mrbrattshs.com/uploads/1/3/2/6/132695392/e09ce1ee6c16.pdf
    • http://files.b-schoolbuddha.com/uploads/1/3/1/6/131608016/8f8d5876ff98c9e.pdf
    • http://files.kope-services.net/uploads/1/3/1/4/131411199/zojunufaza-fefal-posuvuxe-bipufininoleje.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/81624827597.pdf
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/lixaw.pdf
    • https://cdn.shopify.com/s/files/1/0441/2620/8152/files/miguel_wildheart_zip.pdf
    • https://cdn.shopify.com/s/files/1/0436/1207/8243/files/16068612688.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/lijeguvanarep.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/robinhood_trading_api.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4294/4677/files/zamebigavebaziva.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/26024227494.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/vusowutolususezesezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/delinadoxak.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_off00006a10.bin
380567fd5315052e842d120ddf3ab2b95a721d4aca5cca3a8927afb4c09bed73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A10 5548 bytes
font_01_sfnt_off00007cdd.bin
6c96d106a734d9f57dbfaedf1576252763ac15dea27a7b08c85e1ab842db589e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDD 7180 bytes
font_02_sfnt_off00009058.bin
9c8bfcc95ea0aa4cb10838bbdd5feaf3bbca253822fdb7d20a73aecb3f2c76ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9058 9900 bytes
font_03_sfnt_off0000b22c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB22C 4324 bytes

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