Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adf45e0999e1ee1…

MALICIOUS

PDF

83.5 KB Created: 2020-08-10 19:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9586d3e161ac48e112122ecf21ddcf08 SHA-1: 68e34a8a09436aca36c7df914cec9ad58101526e SHA-256: 5adf45e0999e1ee1b96fdefcf13e52d41b34bf8e5aaba2c7c856df33ab3de833
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.com/pify?keyword=ethnographic+study+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate 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=ethnographic+study+pdf
    • http://files.moorearthropods.com/uploads/1/3/1/4/131454143/7603359.pdf
    • http://files.swimbikeruncc.com/uploads/1/3/1/3/131380511/3859326.pdf
    • http://files.monaleighhome.com/uploads/1/3/1/3/131382141/majodumexa-didepem.pdf
    • http://rumuka.whoisnecessityschild.com/uploads/1/3/2/6/132695492/xadukuju-rabonado-felapan.pdf
    • http://files.llandudnosmiles.co.uk/uploads/1/3/2/7/132710624/mawemajawupeziri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/sojipojumupuwabuwilafosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/48821482292.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/jilupukepagikud.pdf
    • https://cdn.shopify.com/s/files/1/0433/5504/6037/files/mesuris.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/nusegolavonebuji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/pezijeluvaxefoliget.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/93876461524.pdf
    • https://cdn.shopify.com/s/files/1/0437/4796/7130/files/19964806351.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/ratatouille_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/bullying_el_acoso_escolar_libro.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/18722386847.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/98736287880.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/bokabo.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_off000105e4.bin
5f110993f8ba1a27d499cd438b48772aed511bd663079da682c8e814eeed19b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 5444 bytes
font_01_sfnt_off00011865.bin
207515ab1949af00590c03bdd6d28c7c7ac364efd817c1e7c5eda691615fa0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 12320 bytes

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