Malicious PDF — malware analysis report

Static analysis result for SHA-256 c558f4a37cf07e5c…

MALICIOUS

PDF

50.0 KB Created: 2020-10-16 09:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f686d8b0111effe48a579debf1344060 SHA-1: 3dedcdf1de8fed13df4d8d5f0b94a788de95b44a SHA-256: c558f4a37cf07e5c99b13fce468e7d2f184027378b25620e0c7f1015c6acf016
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://ggtraff.ru/strik?keyword=fractura+de+colles+invertida+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f8718cdc80f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f874f244a3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f88d86e64247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f86f98540800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f873d3105f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f87d5f636455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f88b9a357486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870afce0df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f87395add23d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0225/1432/files/ladel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8380/1781/files/nalugorimovedujesudalose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3413/1655/files/adithya_astrology_pro_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/larizoxemorukivogefoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5248/9662/files/valence_electrons_present_in_chlorine_ion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5837/7116/files/76818555709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1242/6397/files/maxtube_saje_limited.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/46891455989.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/8305/1431/files/guguwolakegad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/vuzaxipax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8571/8189/files/15973386686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6347/5869/files/hypixel_skyblock_enchantments_for_sword.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/download_gta_v_android_apk_data.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B7 5048 bytes
SHA-256: 49323b99b02694b99c28c9985808ab99184525c43dec69334536878e0233a62a
font_01_sfnt_off000085ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EF 11368 bytes
SHA-256: a2fab0f62a97d122a2a9186f6bed0c95701c0edea5b4713205765babf3108590
font_02_sfnt_off0000aac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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