Malicious PDF — malware analysis report

Static analysis result for SHA-256 7324b55c4d3e2f6f…

MALICIOUS

PDF

56.5 KB Created: 2020-08-09 13:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dafe792fc113c13c2022fcc828bff8c SHA-1: e4bdd684dd287fda22b79b67a704c3b6e39b4988 SHA-256: 7324b55c4d3e2f6ffca2a93cdb25bc58976018fb6bff40ee0fbb3c83fd24e02a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains references to the initial URL and other Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly indicates 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.ru/pify?keyword=13th+14th+and+15th+amendments+pdf
    • http://files.radfordcoffeeco.com/uploads/1/3/1/6/131606094/wumalapodekuj.pdf
    • http://files.retrophilosophy.com/uploads/1/3/0/9/130969965/1a4f1dc.pdf
    • http://files.stabletransformation.com/uploads/1/3/1/8/131856195/rurafopozamob_kaxuzadatu_vabudolenoze.pdf
    • http://files.bettmusicdepartment.com/uploads/1/3/1/6/131637529/lanozenafeliwax.pdf
    • http://nonid.wasatchballet.com/uploads/1/3/1/6/131606165/3512165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54686169254.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2533/files/sepidejopujoniwolikowonof.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/91898855355.pdf
    • https://cdn.shopify.com/s/files/1/0431/6944/8097/files/b._pharm_colleges_in_tamilnadu_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/2946266932.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/46160433736.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/xegapirefoxuxaxubamobovan.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/43827276921.pdf
    • https://cdn.shopify.com/s/files/1/0437/6304/0408/files/audio_power_amplifier_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/physical_description_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/pelibugilunirovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/98221240205.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5108/files/bible_bookmarks.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/varod.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4668/files/88876867026.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_off00009d0a.bin
250bad185bddc9f027663b184e593e19c308210bf72d0735669e6236c6ecf07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0A 5488 bytes
font_01_sfnt_off0000af9f.bin
71e100d6ec5004d3ad5fe471a9baed9c9929ca057bd048f457823a94a6c2381f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 10356 bytes

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