Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf041cf2ca02572…

MALICIOUS

PDF

52.5 KB Created: 2020-10-01 05:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1a655d9f0e0e2c50f3f9df40f3b07033 SHA-1: a336d46c7fdb1de1c80185aa20ff25120170319a SHA-256: acf041cf2ca02572869f1c3bbaf391e7e571602b6542fa648da34592222c6f56
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://gettraff.ru/strik?keyword=small+pdf+programa In PDF document text
    • http://files.willparkermusic.com/uploads/1/3/2/7/132710722/8899949.pdfIn PDF document text
    • http://xubefa.chenyilei.net/uploads/1/3/0/9/130968984/defukoxavitufoj.pdfIn PDF document text
    • http://nopazu.shannon-nightingale.com/uploads/1/3/2/7/132710773/7277703.pdfIn PDF document text
    • http://toxijov.dannythecoach.com/uploads/1/3/1/4/131437792/132990.pdfIn PDF document text
    • http://files.cothrons.com/uploads/1/3/0/7/130775640/mugibufufomode_vozuzawenali_xagodufoxigesij_febotukidur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f11f5f-2eec-4b2a-b4b5-7b7ede0136ef/figoxemor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/6745/8980/files/27676939855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/78111826431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9200/0422/files/sutow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/jaferukonejakotawijezufip.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_off00008f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F84 5288 bytes
SHA-256: 350d2a2b901b0ab8da0ef08d252abdf1d3dae06b9dec4f9d6b1464245a906457
font_01_sfnt_off0000a167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA167 10636 bytes
SHA-256: 9060642c325fbd8f3c5ea346ee865c1f050193935e7af7eee6d7a3463ee2b82f