Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf10a4956b26c7c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 09:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 778ca5a2b2bf594a07064631c098d8a5 SHA-1: db0d7341d8b7744adf57b327c3829457dc67a918 SHA-256: 2cf10a4956b26c7c68a77d0de7c19ee8c95c9eb110387496337142f1acbb3d59
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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=small+pdf+download+for+android In PDF document text
    • http://dimezeg.rushizle.com/uploads/1/3/1/4/131453133/fejivopekitepog.pdfIn PDF document text
    • http://files.doubtfulprospects.com/uploads/1/3/1/4/131438843/kakorebakikaxi.pdfIn PDF document text
    • http://files.onesource-ph.com/uploads/1/3/0/8/130874347/2383161503.pdfIn PDF document text
    • http://files.elportalschoolptg.com/uploads/1/3/0/7/130739268/6931529.pdfIn PDF document text
    • http://files.townscapepaintings.com/uploads/1/3/1/8/131856158/valowixopigoxi-bufatatopox.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/1/0430/3516/4835/files/novubogaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/ielts_vocabulary_booster_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7886/7354/files/37826310779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2870/7485/files/adding_integers_practice_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/57972929168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/nuvokobepakokitedirar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/vosekiginamor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0668/7389/files/35709566422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lujodegiduwidixerilaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/63755944022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6568/8743/files/bonowabetexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/tidafug.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_off0000676a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676A 5204 bytes
SHA-256: b6d1ff225577c7a15cf1b8310914f952ae845874a76afde086250982f1a66fa0
font_01_sfnt_off00007912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7912 9900 bytes
SHA-256: ec7ef4786cdc348ade611e5a689b1e1682f610daad62cfd1368576d0b0cc760c

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