Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fd84f6d98889bc…

MALICIOUS

PDF

42.9 KB Created: 2020-10-15 07:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 531b954a879dff6d178273e723a089f1 SHA-1: 9cbce44c888eff50c8df005358d8dab0884003e1 SHA-256: d5fd84f6d98889bc684a3b41f2f1b5fd8cb29aa78b78d0ef3eda150043e9110c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link to a known malicious redirector, which is part of an SEO link farm designed to phish users. The document body explicitly mentions 'Download kali linux for android without root' and presents a clickbait-style lure, indicating a social engineering attempt to trick users into clicking the malicious URL. The ML classifier strongly supports the malicious nature of this PDF.

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://ggtraff.ru/123?keyword=download+kali+linux+for+android+without+root In PDF document text
    • https://site-1039817.mozfiles.com/files/1039817/87187787760.pdfIn PDF document text
    • https://site-1048474.mozfiles.com/files/1048474/kazonikanaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f876c3fe8a9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8769630846d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f87356e9b95b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f86f8c21e477.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000682a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000682a.bin)
    • https://cdn.shopify.com/s/files/1/0439/0299/2536/files/libro_el_profeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3562/3076/files/lingering_injuries_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/challenge_spelling_words_7th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2578/3190/files/asintotas_de_una_funcion_racional.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9209/0784/files/atlanta_dump_hours.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4721/5000/files/zulaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d9a9d0-8eca-4019-aaec-9abc98bd8cfd/xotupesowunedulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b996a4cd-2432-457c-b791-7f370d03f78c/zemim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9570256-19e0-4b6f-b9c9-2a1a5ba891ec/wupigusixagiralifogimusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3222/6203/files/dojidoxupalanegifoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/wish_daily_giveaway_not_showing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1108/8799/files/hyper_sonic_the_hedgehog_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/70998448163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0287/0947/files/suxexigusoxodi.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 extracted file (font_00_sfnt_off0000682a.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682A 5040 bytes
SHA-256: 646b8cc88a227463a87c52f3d14d22f37eeda354b49073adcb99754f89a243bd
font_01_sfnt_off00007964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7964 10668 bytes
SHA-256: 5817f764fd432e52f850e5252bb49b96d692a1a45ac9244770dfb49f3f017804