Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbf07185118c67d…

MALICIOUS

PDF

61.9 KB Created: 2020-08-07 19:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1ce29433fd2d5905ce6408965c6ce917 SHA-1: 568f8203636f636048413872aeda61c7ef63aa3b SHA-256: cfbf07185118c67dfcfb732bd366fc177c343af5f4fda1e1d23b62c444b88dfb
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://ttraff.com/pify?keyword=maths+formulas+for+class+9+ssc+pdf In PDF document text
    • http://files.ck1design.com/uploads/1/3/0/7/130776371/2966690.pdfIn PDF document text
    • http://files.simplyequaleducation.org/uploads/1/3/1/4/131452961/a60d03c40cad96.pdfIn PDF document text
    • http://files.custercadet.com/uploads/1/3/1/4/131453401/diwixodam-pexakesazipubi.pdfIn PDF document text
    • http://files.librariesofhopestore.com/uploads/1/3/1/8/131871705/4551667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/pizagoporeberifefilikilom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/77149836754.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/jopikiriraremix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/rujisafikuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/bujukibuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2685/8662/files/kekokudakubupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/89413667743.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/rikeguwebufezutudavakofuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/506_assignment_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4613/2119/files/9007078672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/xutolixod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D88 5164 bytes
SHA-256: 6a9ddc77fd3fee7d3e08c354afa01cc234e9e2d5e1957ac397ce2349ed8175e6
font_01_sfnt_off00008f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F16 16716 bytes
SHA-256: 90a29952b204811d556ee881f2dee064a3aa023c76cf954565490efac56c20d7
font_02_sfnt_off0000c36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_03_sfnt_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 7280 bytes
SHA-256: 6de9c42acf37b7ddc130cde27172d6af98513c87b66c1cb8ec76d4c24447cdd7

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