Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4114a78bb9158ec…

MALICIOUS

PDF

38.2 KB Created: 2020-08-11 00:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d57b6511866de1cb5e1343770b85f99 SHA-1: e94ba2dfba128250b4cc58b39f4baca206586481 SHA-256: c4114a78bb9158ec2b28b065148ded2e0928f512002d3ed9853b045da31f0c35
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=cambridge+dictionary+of+american+idioms+pdf'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via the embedded links.

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=cambridge+dictionary+of+american+idioms+pdf
    • http://files.metrovinyl.co.uk/uploads/1/3/1/6/131606815/giximuzubu.pdf
    • http://luten.whatsnextreport.com/uploads/1/3/1/3/131383629/5298462.pdf
    • http://files.paphal.com/uploads/1/3/0/8/130874180/guzedimuzev.pdf
    • http://zuveso.pavlinkoproshops.net/uploads/1/3/1/3/131379510/72cdcf56c3.pdf
    • http://files.leifrichardson.org/uploads/1/3/2/6/132681891/3536546.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/xepubejorafig.pdf
    • https://cdn.shopify.com/s/files/1/0436/7322/3321/files/que_es_el_control_de_calidad_total.pdf
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/bible_verses_about_thanksgiving_and_gratitude.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/vururujetimiwujulafadi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4575/4792/files/sight_word_bingo_printable.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/xevawazuvufifosedilesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/95976535730.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/28982526295.pdf
    • https://cdn.shopify.com/s/files/1/0438/2438/2114/files/tikagufukovepajabilarufox.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1138/files/fijikowizabebexobapumux.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/html_tags_and_properties.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/kewovoke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad0.bin
3811ae566d8bce62598be930c2cbf7b50815e5a535a905310164c4c5a367c25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD0 5496 bytes
font_01_sfnt_off00005d6d.bin
f644a61123af47c0ec30933150f91f03fb134e2f1956d744b2409b8c4f67949b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6D 9420 bytes
font_02_sfnt_off00007d92.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D92 4324 bytes

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