Malicious PDF — malware analysis report

Static analysis result for SHA-256 340120d71db1a6d5…

MALICIOUS

PDF

40.8 KB Created: 2020-08-11 17:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d28c7d9207e204415ecc7cd8eda8e7a SHA-1: a347ed28a66a2613b94ce26d7effef48b75a9f4d SHA-256: 340120d71db1a6d5b9f5bd9703d4ea41f33aa00c0377561e434e18547be9eb6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to external PDF files. One of these links, 'https://ttraff.cc/pify?keyword=cdf+and+pdf+matlab', is flagged as a malicious redirector. This suggests the document is likely part of a link farm or SEO manipulation scheme, potentially leading users to malicious content or phishing sites.

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=cdf+and+pdf+matlab
    • http://files.peregrineperformanceproject.org/uploads/1/3/0/9/130969434/joposobelu.pdf
    • http://files.flashbackmarine.com/uploads/1/3/0/9/130969663/zuguridule.pdf
    • http://files.johndecastro.com/uploads/1/3/2/7/132712072/793188381eab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3967/6821/files/difference_between_budgetary_control_and_standard_costing.pdf
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/xibulituraxijawen.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/xutexuzu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8116/files/mandat_cerfa_13757.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/nupaxejili.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/what_week_of_the_year_is_it.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/fusionner_deux_sans_logiciel.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/furebigedulasaxixana.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/89231546612.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peregomosurexezobosezob.pdf
    • https://cdn.shopify.com/s/files/1/0435/9602/1919/files/biosocial_theories_of_crime.pdf
    • https://cdn.shopify.com/s/files/1/0434/2792/2076/files/bible_study_guide_for_couples.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/emerging_approaches_to_educational_research_tracing_the_socio_material.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_off000059c4.bin
dcd258371dce6aee58b217740c9774935e0f145c3fc8bf06e3b5e51b083dbad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C4 4960 bytes
font_01_sfnt_off00006a8e.bin
11c9f1f5a2f79bb3234cf3ed8255fabcc3a8f41df2d42fb9c2acfa760de0f50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8E 14108 bytes

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