Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc72575421c7a9fb…

MALICIOUS

PDF

56.8 KB Created: 2020-08-08 16:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e2d95fd7317a624512ad4547bed5e403 SHA-1: b7638aab6e3a0bfb5ffcef3579c25b94b06c278c SHA-256: dc72575421c7a9fbc0ddf16fcf62a32d616d4764f476811fe786e92bbc6b07a8
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=an+anthology+of+short+stories+pdf+download In PDF document text
    • http://wijoga.fountainsquarechurch.org/uploads/1/3/1/6/131606875/956467.pdfIn PDF document text
    • http://files.wyomingspeechlanguagehearingassociation.org/uploads/1/3/0/7/130776130/5a236.pdfIn PDF document text
    • http://files.thruhannahseyes.com/uploads/1/3/1/4/131453124/6153976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9234/4993/files/amphiboly_fallacy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/xesuzin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/98577263118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/27623909343.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/wwe_theme_song_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8144/9124/files/casing_design_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/dizutolezuniwakez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/bootstrap_space_between_rows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/kibezedezojepagizisewen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/computer_networking_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D80 5484 bytes
SHA-256: f54426310d05d6110d095aded7fe9109143afeab0e10c1e1869c1dacf314751e
font_01_sfnt_off0000903d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903D 2576 bytes
SHA-256: 297f52f4236f09ba58e85c0251406db64a4d3221d73012e717b108c12409d6fb
font_02_sfnt_off000099fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99FC 10360 bytes
SHA-256: 6850f300650b1dc79ffe9549805a51284302dd4c88cb19e00291008d351b2f79
font_03_sfnt_off0000bd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6E 16780 bytes
SHA-256: 68360d215686b7ffd363eeb0253592cf4566abf286d77cfdfbfe23f63f7602e1

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