Malicious PDF — malware analysis report

Static analysis result for SHA-256 f900786e95aeb14b…

MALICIOUS

PDF

37.5 KB Created: 2020-08-06 21:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e1f11bb91cc37431002a2440e2f7762 SHA-1: db20c47068b8258630cf4cddd83fd7c8cd72864f SHA-256: f900786e95aeb14b805abd54f70529d2f9e2c4f03dfcdfbffbe8a7df1bc10298
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.cc/pify?keyword=adobe+pdf+reader+for+android+apk', is designed to trick users into downloading a fake application. The document body, though heavily obfuscated, contains references to this malicious URL and other benign-looking Shopify links, likely part of a link farm to improve SEO for malicious content.

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=adobe+pdf+reader+for+android+apk
    • http://gijub.legacycaengineering.com/uploads/1/3/2/8/132816066/tejukidoteko-kadopopoli-tudulirapub.pdf
    • http://files.asifthinkingmatters.com/uploads/1/3/1/3/131378990/mirovos_rubiru_raburabuzofapo.pdf
    • http://files.integralsteps.org/uploads/1/3/1/3/131379042/1005e6295911.pdf
    • http://files.democraticclubofthewoodlands.com/uploads/1/3/0/7/130740563/0d32fc94.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41230052817.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/kugunonogusepufivugul.pdf
    • https://cdn.shopify.com/s/files/1/0437/9305/5904/files/final_fantasy_viii_rom.pdf
    • https://cdn.shopify.com/s/files/1/0440/8328/2070/files/academic_dishonesty_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/xagubalojebuzatubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4471/files/landscaping_contract_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60561448525.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/assistant_accountant_job_description_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/43991658506.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/degejuwetisagemudow.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/96060663187.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/bribery_and_corruption_policy.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055f7.bin
1d432781abfbbe47ca8307755f4fba3d5bad591b712583c9e37585b9ea9ec459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F7 5016 bytes
font_01_sfnt_off00006716.bin
daf374bd42ccc0e1a4bf98152a9539367da6ce6ac66f6a0329835a80b215137e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6716 9980 bytes

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