Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16d26493020f0b9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-23 21:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9b9d7cec088686654faef7176922c8 SHA-1: d16a3fceae57e3fc6a1cf945570f1c621d85f1ee SHA-256: f16d26493020f0b9df0abfc5aba4b85b547749c8584a6f74f212182830b761b4
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a "Sat practice test 10 answer sheet". The document also hosts a large number of external PDF links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.ru/pify?keyword=sat+practice+test+10+answer+sheet
    • http://files.harmonyorganics.net/uploads/1/3/2/6/132681438/xukoto-tezituduzab-xegirofowosis.pdf
    • http://files.webcamgreece.com/uploads/1/3/0/7/130740258/4986347.pdf
    • http://files.rachelborgman.net/uploads/1/3/1/3/131383384/ziwipo.pdf
    • http://jomos.joyfuljourneystravel.com/uploads/1/3/1/4/131410227/fubazovetejego.pdf
    • http://xusofuf.clare.church/uploads/1/3/0/7/130776483/jesajil.pdf
    • https://cdn.shopify.com/s/files/1/0435/5804/3807/files/accuweather_dover_de.pdf
    • https://cdn.shopify.com/s/files/1/0430/9857/0909/files/uselo_y_tirelo_eduardo_galeano_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/hallelujah_chorus_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/bharathiar_university_mba_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3752/files/dutazexifowojomabuzabax.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/pdf_antropologia_forense.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/1003_loan_application_word_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/cavy_animal_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0961/files/arabic_numbers_in_words_1_1000.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/tawituvavemuje.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/bpsc_assistant_engineer_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5468/4565/files/4406348927.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_off00007081.bin
9dad846059d4436f6051e27ead5438b8f6bc644815acd8fd6719874111a1bd4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 5376 bytes
font_01_sfnt_off000082d3.bin
330b95451e337dc76b6a85e58d90036576c6447cd03b9e489d4b3a3dfba1a5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D3 10404 bytes

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