Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d68021fa0f3bae…

MALICIOUS

PDF

55.9 KB Created: 2020-10-30 09:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: f65414c5ed027cb01126e11735c0b44a SHA-1: a0ddf0693cc4b869fc6f522821b5a4ba1bc0671f SHA-256: 20d68021fa0f3bae160b58a4f8707d799015cd68d99104e274ce5c3414b51df8
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.me/123?keyword=ud+men%2527s+basketball+recruiting In PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/zijapimup_numexin_musukameruk_mexasog.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00008590.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00008590.bin)
    • https://cdn.shopify.com/s/files/1/0492/3018/4601/files/nurerados.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/72938319109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ceecb9-4fb1-4e48-80cc-900234076215/retogivepowijepovidulofex.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/98377364643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8488/3122/files/ielts_introduction_questions_with_answers_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/nanujenibadifaboz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2186/3582/files/95454223606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6523/2546/files/lenovo_p320_sff.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/post_disaster_sex.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/seror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d609c7-a0ce-410b-9285-d330e883af44/lesirudetilapitenizap.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/solution_of_integral_calculus_by_das_and_mukherjee.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/61365136550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6623/1446/files/isaac_newton_y_sus_leyes_de_movimiento.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 extracted file (font_00_sfnt_off00008590.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off0000bd36.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0000bd36.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8590 5488 bytes
SHA-256: 28128b22f3e4ef290f673562219bd2f5b9f4099cd0476e8b7f42d3adc9a8d42d
font_01_sfnt_off0000982d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x982D 11184 bytes
SHA-256: d9dcdd5975007adf3ce10a825c65e622c4d13c35bc951a64af207428a6ca9c72
font_02_sfnt_off0000bd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD36 16080 bytes
SHA-256: bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7