Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31106995edb24aa…

MALICIOUS

PDF

61.7 KB Created: 2020-08-12 23:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 916a93d8bc2da9efa24858e4deccfafe SHA-1: 68d2be33c0ba8eb34e9f1b821d3a2e7037b3be90 SHA-256: b31106995edb24aa9271f032f50ac8800778517e53b5750ab074bc1543e3a24f
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=aditivos+alimentarios+pdf+libro In PDF document text
    • http://files.wonderlandintouch.com/uploads/1/3/1/4/131437064/dufizabunigi_danoxopip_tagazugobobip_sepisuzujoxopax.pdfIn PDF document text
    • http://files.carolgrice-curran.com/uploads/1/3/0/9/130969498/f3592f10080e4.pdfIn PDF document text
    • http://files.determinedtolearn.info/uploads/1/3/1/4/131406800/zogiwub-fobabujojejek-mojikelimej.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/1/0431/3884/2779/files/92618440762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/bepazu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4890/9462/files/arithmetic_sequences_and_series.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depusulolunifanilux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/35135980111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/99679700911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/pitagakafufimanejemizav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/jewimozibutixokokiganumep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/4963200738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5820/0725/files/wubowudazuxuxawugoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/organic_chemistry_klein_2nd_edition_solutions_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2A 5376 bytes
SHA-256: 0f9799f5c47b30c9049c7de7d24def27a4ead68e176bfb275c09352d1a3aabaa
font_01_sfnt_off0000ac5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5E 11908 bytes
SHA-256: cea984350686a8c3f9996aafabe4fa2e909ca11f5bde2286cd3e07b97a9a041b
font_02_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 16060 bytes
SHA-256: cc955599e1402122f3fd904a9e5854912e4098783d728166c1cdd9aa96b9b01a

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