Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e99c8dbf1c6921b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-27 20:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 966f3b2a8f0deb495b799f9e3a15f135 SHA-1: 772f5b32ec7c46de319e32351eeaf478abec0b53 SHA-256: 6e99c8dbf1c6921b3d2f49b7a0cf71b090d15d73bbdcd3e446e4767f4a60c25a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as "Problème d'optimisation exercices corrigés". The ML classifier strongly indicates maliciousness. The document body also contains numerous links to external PDFs, suggesting a link farm or a method to obscure the malicious redirector.

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=probl%25C3%25A8me+d%2527+optimisation+exercices+corrig%25C3%25A9s
    • http://ferij.lyncostudios.com/uploads/1/3/0/8/130874197/09b306bb.pdf
    • http://files.thescreamingrocks.com/uploads/1/3/1/4/131438353/pewafuz.pdf
    • http://files.roberta-comunian.uk/uploads/1/3/0/8/130874489/memeriz.pdf
    • http://sesad.lighthousehorserides.com/uploads/1/3/1/6/131606339/7088320.pdf
    • http://fomuvow.shadyriverlaporte.org/uploads/1/3/0/9/130969754/tunupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5111/4908/files/tm_9-_2320-_387-_10.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/rilutubijemogejavijomowiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/prisma_literature_review_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/blank_june_2018_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8670/files/gunumijipenipivobumul.pdf
    • https://cdn.shopify.com/s/files/1/0438/2294/0320/files/important_name_reactions_in_organic_chemistry_class_11_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/22885521719.pdf
    • https://cdn.shopify.com/s/files/1/0429/2722/7036/files/70297327003.pdf
    • https://cdn.shopify.com/s/files/1/0435/6872/6171/files/hypothyroidism_guidelines_aafp.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9927/files/swot_analysis_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/relumo.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_off00005ee8.bin
ff20611e36973960d33a74ea2c7cf35587f0fd9919951783c37153eaa4d666b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE8 5920 bytes
font_01_sfnt_off00007259.bin
7d406da25bfe93f440ba2a9e299b9e32d4c8cbbbaad2766f738d898f22fb82bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7259 11628 bytes

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