Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d57c24ceb3e7c6…

MALICIOUS

PDF

47.8 KB Created: 2020-10-08 10:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 108ceba1e003ee0cd4a51210805b8dd0 SHA-1: a6a56aefc8f41143d7ce3fe9c81b2e087ed8a057 SHA-256: b8d57c24ceb3e7c679242f6130610a4ff48b61fe11e5c7e76aba9d9c146c4bff
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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=2012+vw+cc+owners+manual In PDF document text
    • http://lakerev.pamelaarmstronggallery.com/uploads/1/3/0/7/130776693/mumugafetixugu.pdfIn PDF document text
    • http://purizenof.chemungfire.com/uploads/1/3/1/6/131637372/6620215.pdfIn PDF document text
    • http://files.durangofarm.com/uploads/1/3/1/6/131637043/165730.pdfIn PDF document text
    • http://files.sailrockaway.com/uploads/1/3/1/4/131453252/kilajore.pdfIn PDF document text
    • https://site-1039578.mozfiles.com/files/1039578/63002540874.pdfIn PDF document text
    • https://site-1039360.mozfiles.com/files/1039360/zejulipikalefatug.pdfIn PDF document text
    • https://site-1040798.mozfiles.com/files/1040798/70095456580.pdfIn PDF document text
    • https://site-1039266.mozfiles.com/files/1039266/49077994607.pdfIn PDF document text
    • https://site-1036861.mozfiles.com/files/1036861/11875977541.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/1/0432/5376/0162/files/elsa_plush_doll_ty.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5715/0632/files/adams_pentagon_flea_and_tick_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0726/1341/files/90253920337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5477/8536/files/watch_boardwalk_empire_online_free_watch_series.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3041/3980/files/gegejezokema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/let_me_love_you_lyrics_ariana_grande_meaning.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_off00006fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA4 3304 bytes
SHA-256: 7054202772682b24f11599058d951f637b8cd39cbb91149f9ca434d6f8725165
font_01_sfnt_off00007b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B89 5328 bytes
SHA-256: 475e399bd0d2f31c818bd7724065542d1173a66c6e65a8b738d218b23cdfe4c6
font_02_sfnt_off00008da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA5 11404 bytes
SHA-256: e59b1afe8b1352dddcc69cd6bd553047581624cb3907705aba523a85d93793b2

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