Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f1005a57fb3c94…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 22:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e11d27f15a43dc19da9e7403d8ec22ea SHA-1: 5200b6905d08d194cdd2f658218259d0360dc910 SHA-256: 78f1005a57fb3c943510cf962249b36d6131d64cebd11b96b900ca9270a61c80
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or SEO abuse. The primary malicious URL identified is https://ttraff.com/pify?keyword=bland+diet+pdf+spanish, which is likely used to funnel victims to further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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=bland+diet+pdf+spanish
    • http://files.drivinglessonsrichmond.com/uploads/1/3/2/3/132303230/b0c9f25d.pdf
    • http://files.markssupplies.com/uploads/1/3/1/6/131636807/38f7ff46.pdf
    • http://files.lisamariamadera.com/uploads/1/3/1/0/131071240/8241466.pdf
    • http://files.photography-timeless.com/uploads/1/3/1/3/131379115/2825602.pdf
    • http://files.keithdeininger.com/uploads/1/3/0/7/130739509/9505567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/tatagufasasaxopobu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3883/files/wunusadusirepaxawur.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/fujuma.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/pekitazakoxesufomitew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/20745074648.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/statistical_analysis_with_excel_for_dummies_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5503/6054/files/functional_foods_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/wewinalaxasaravisuxifujud.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5415/files/19131690484.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7546/files/pejonakulejizi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/lethal_autonomous_weapons_systems.pdf
    • https://cdn.shopify.com/s/files/1/0438/8339/7275/files/20682589947.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/19690640855.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_off000062c3.bin
5409e833d65e14067fe100272ffff80b059528c55ea4b975c1db126e91eefd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 5080 bytes
font_01_sfnt_off00007407.bin
d17b80feaa6138ba67ce62ba9b6194a3a7502d68996d6a5fe086067399e166ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7407 10364 bytes

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