Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cded91d5b9c158…

MALICIOUS

PDF

39.6 KB Created: 2020-10-11 12:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 4cbdd6e5690a42c383ee4d504cc37065 SHA-1: 7c2f8bcfc1990172ffb3136290eef923b8d5805c SHA-256: 73cded91d5b9c1588b4eb28b327667a2a79cc6333ebc906c485c9a5aa33afe54
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/pify?keyword=lagun+mill+parts+list In PDF document text
    • https://site-1039864.mozfiles.com/files/1039864/merivimujizovaxove.pdfIn PDF document text
    • https://site-1042095.mozfiles.com/files/1042095/21917319329.pdfIn PDF document text
    • https://site-1042824.mozfiles.com/files/1042824/92444374050.pdfIn PDF document text
    • https://site-1042100.mozfiles.com/files/1042100/taxukomajobiti.pdfIn PDF document text
    • http://negem.richardsonlegalpllc.com/uploads/1/3/2/7/132710621/rekaji.pdfIn PDF document text
    • http://vebasinob.mrsperkinsworldhistory.com/uploads/1/3/0/7/130776356/pubipuba.pdfIn PDF document text
    • http://files.putnamcountymonument.com/uploads/1/3/1/8/131871816/d7a996db7.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/1/0437/2434/1400/files/nozujoxadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5246/8901/files/how_to_fix_a_paperpro_stapler_spring.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6419/9841/files/kizivagorake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9548/5352/files/79049750198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/1731/4975/files/wumagixujexozoreseni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fe14ce-ed3d-41c4-a6d5-5536db95b84f/tefuluxunarodutazefujub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1682ad8c-439d-476b-b6c9-296f366febe9/44514609925.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4A 5080 bytes
SHA-256: a98130b57d6024ed1e858ff17fb71ff26f29180897951d9ebabd79099b0bee59
font_01_sfnt_off00006e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E79 10436 bytes
SHA-256: d1b811ed952439c880ae5f95efc3ba2bdca51613f7399fbc4aa289dc33dfc6c9

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