Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe55b3aa3c5f7e4f…

MALICIOUS

PDF

43.3 KB Created: 2020-08-22 20:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1595085bbf272dc0ee8b719b16754bec SHA-1: 61ee77c5830a7b34cbaed239dba53d98cf5749aa SHA-256: fe55b3aa3c5f7e4fd6a1bd91af805d9721f1f6b1d5c932db14da60484eea9c55
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.com/pify?keyword=bully+apk+mod+menu+obb In PDF document text
    • http://koduvo.shellysrockshop.com/uploads/1/3/1/3/131378780/ruvavazovit-luvudava-nevame-pawutijofi.pdfIn PDF document text
    • http://susizoza.bobartdawson.com/uploads/1/3/0/8/130873715/jofupokaw.pdfIn PDF document text
    • http://files.vintonswcd.com/uploads/1/3/1/1/131164456/xewij-titodevexeze-puliv-pewugaloje.pdfIn PDF document text
    • http://files.simplyhomeco.com/uploads/1/3/1/4/131454620/519d03c572fa.pdfIn PDF document text
    • http://derex.learningaboutamericanhistory.com/uploads/1/3/1/1/131164394/kekuz.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/1/0434/5112/1820/files/69850766687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/66886077134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0067/files/87528391877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/11759551010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/history_alive_the_medieval_world_and_beyond.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/feramomitajubamiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/clinical_study_protocol_synopsis_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/ximaba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6173/1743/files/20835170208.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/puzepomed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7181/5331/files/nudifepopa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5658/5111/files/kodak_software_downloader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/section_modulus.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_off00006a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A21 5188 bytes
SHA-256: ef78f4876993a7fd9c77f76075ee80a1743256489ebc3d6db07c3a0132e5f163
font_01_sfnt_off00007bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB8 10720 bytes
SHA-256: 94e33f58d5e27c4cca4ffccdf60fd2307af0b9680cf45e67a0b854930b74e061

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