Malicious PDF — malware analysis report

Static analysis result for SHA-256 729c9cecb178bb46…

MALICIOUS

PDF

46.4 KB Created: 2020-08-18 22:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7946f39d32aace40e0187a8e22b7080 SHA-1: 9e772816aa4e30f8c21212475f95ea2eaa970e59 SHA-256: 729c9cecb178bb46a5be85ecd4f6ea39ff98211fcbc4a704a7d5003a4d520991
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 of which point to potentially malicious redirectors or link farms. The document body, though obfuscated, contains a URL that leads to a redirector, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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=bronchial+asthma+guidelines+2019
    • http://jesepaj.nannies-pearls.net/uploads/1/3/0/8/130814328/famoruviwefoke.pdf
    • http://ranupiw.polloperu.com/uploads/1/3/2/6/132681337/maxepegajinimowesis.pdf
    • http://files.shlimaz.com/uploads/1/3/1/4/131408280/zusiduwitesole.pdf
    • http://vuvajovu.biophilicdesign.net/uploads/1/3/1/3/131398140/migujitaxo.pdf
    • http://files.mintaddition.co.uk/uploads/1/3/0/8/130813364/rawepunozumox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/active_passive_exercises_mixed_tenses.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/67494830132.pdf
    • https://cdn.shopify.com/s/files/1/0445/6851/0623/files/6271838049.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/zowamosajozodakofomuxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/bogigefirid.pdf
    • https://cdn.shopify.com/s/files/1/0434/9919/2472/files/94111015900.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4687/files/larson_calculus_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/gipefoxujunipegalavezu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/polirilapamowogiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/colon_semicolon_worksheet_ks2.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_off000076db.bin
6e4a814be5e132373ebf2c2061f2336eea5347fbc3ec4ca27f58c8964dbbd6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 5884 bytes
font_01_sfnt_off00008aa7.bin
6b9c0494d62b3dd997383407383d0f1b68fa0f7556f7b72805d5168a60257028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA7 10000 bytes

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