Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dad7384e2d689b…

MALICIOUS

PDF

42.0 KB Created: 2020-11-07 03:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7f0ffae0a1d158eafa5edab0e1e0d20c SHA-1: ce9deaf9e7cc7340300bde4e46736f9478c016fa SHA-256: 57dad7384e2d689beb07ce74d156f859777e9fa24e9a7633e2c71ffce0c8323c
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=minecraft+hand+disappeared PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5fa293c0b95d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5fa20f4aea0c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://luwoposafepi.files.wordpress.com/2020/11/cliff_robertson_pt_109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e05cfd-f1bc-454b-b014-268ef7926b14/rukogibalumeteku.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/dopalobubaxor.pdfIn PDF document text
    • https://zasalekuvine.files.wordpress.com/2020/11/cigar_box_guitar_chord_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/26358001643.pdfIn PDF document text
    • https://tibazimujo468501389.files.wordpress.com/2020/11/la_conga_de_jalisco_va_y_viene_camin.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/4858086604.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/explorers_guide_to_wildemount_online.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/20042446963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1289f2-2471-4a90-b6e1-533e899e9372/mabor.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_off0000667a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 5216 bytes
SHA-256: 52331c1c1bcdacbf08f2891c48e75ae2040c0f0331deea85b338e9b1aa8c56c4
font_01_sfnt_off0000783f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783F 10228 bytes
SHA-256: 25455e03918e66870c8c9d800fc9c290f6c7a1840f78cfbc1136aa33098e304b