Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758c50d51de6ae1…

MALICIOUS

PDF

41.2 KB Created: 2020-08-10 18:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 36e11f0c7cc525966ce59a6ce19d1c3a SHA-1: bab6068ee377d59c3083743b0bb1aa1868ec0cd1 SHA-256: c758c50d51de6ae17c4726fe61482bd780adaa61026bb6a1247315ebcc1ef4a1
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://ttraff.cc/pify?keyword=pdf+file+reduce+size In PDF document text
    • http://files.rebeccabeaird.com/uploads/1/3/0/7/130739628/caf4a1.pdfIn PDF document text
    • http://fakox.cccrw.org/uploads/1/3/0/7/130775971/munogoribibo_moxoz_daxes.pdfIn PDF document text
    • http://files.douglasenoblepainting.com/uploads/1/3/0/9/130969322/b146650590c2b.pdfIn PDF document text
    • http://files.palmgrovemennonitechurch.com/uploads/1/3/0/8/130874029/wizajanug-galezatus-duwabaso.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/1/0431/7013/6218/files/sitazopuwemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/dejug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/panokokovubibabajavukaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/15685412464.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2858/6402/files/33082952565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7019/1771/files/xizowid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4127/4521/files/html_prevent_autofill.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/rakizus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/zabakarorakoragekebaxer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/rutasugumigapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/duwim.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_off00006519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6519 4856 bytes
SHA-256: f8e1abde017deddcf0fed9724b7b87b0d87d8887599efb149d7fa03fb8536d79
font_01_sfnt_off000075aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 10112 bytes
SHA-256: 432cc83c8a12e2ec9f679b370afaebaa099eac345646e8d0b293a28b3ef03396

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