Malicious PDF — malware analysis report

Static analysis result for SHA-256 879848f5f084dfc8…

MALICIOUS

PDF

46.7 KB Created: 2020-08-05 18:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a615f83223009100fa35419a1bdfc10 SHA-1: 639ae8b3fe43191e1f25f14378fa618de034f058 SHA-256: 879848f5f084dfc85d90742546eafd28392e31cad1f4a6530cb905d7e47cfb8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm designed to host malicious content. One prominent link, 'https://ttraff.cc/pify?keyword=honda+company+balance+sheet+pdf', redirects to malicious infrastructure, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

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=honda+company+balance+sheet+pdf
    • http://files.meredithreyesfit.com/uploads/1/3/1/3/131383743/totel.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://files.hellotherehuman.com/uploads/1/3/1/3/131398347/1192907.pdf
    • http://files.utahstudentnurse.org/uploads/1/3/1/4/131406092/78588c4.pdf
    • http://files.southeyeclinic.co.uk/uploads/1/3/1/3/131379874/kiwivizunamilipulot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/lozipivutuxale.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/libudigusajavawojugobabe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/rogojaboparapipetopilud.pdf
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/android_programming_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88490435411.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/water_resources_engineering_mays_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/philadelphia_phillies_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1749/files/katunulo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3846/files/35824171856.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/joxeziwitizad.pdf
    • https://cdn.shopify.com/s/files/1/0434/4279/8757/files/kindle_paperwhite_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3493/files/how_to_uninstall_word_on_mac.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_off00006800.bin
5984a2cdd4d00327f0b197ad7221039b8ca4d15fdaa5c7414ff1274392954854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 5500 bytes
font_01_sfnt_off00007a92.bin
42e8ff4c36bc29a05f6d79bedc86c2d3518b2078e3f5696e3baaaecd96ae4064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A92 15808 bytes

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