Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1957b32449db74…

MALICIOUS

PDF

43.1 KB Created: 2020-09-15 06:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b4ff2b3551e9456ed709b7775eec4c9c SHA-1: 341a5531a14b47ae286c9f0a4c666c2f697e7694 SHA-256: 2a1957b32449db7417be6a390481d0200ddc387c0d190e348f64a14a5c37a1e8
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.link/pify?keyword=ideal+gas+law+life+example In PDF document text
    • http://files.aquaticclub.org/uploads/1/3/0/7/130738803/felerudiramib_zitegibutoxe.pdfIn PDF document text
    • http://torej.mrmanzin502.net/uploads/1/3/1/4/131452841/5815684.pdfIn PDF document text
    • http://fobujeka.as4u.us/uploads/1/3/0/8/130814004/ketanumafofewum.pdfIn PDF document text
    • http://files.empirewindsandstrings.com/uploads/1/3/2/7/132740541/d667b9b91.pdfIn PDF document text
    • http://files.willdobud.com/uploads/1/3/2/6/132681617/remagobejarelajunu.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/1/0433/0687/7080/files/wudogezemolajefenupil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6256/5781/files/forma_de_chocolate_controle_video_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/zazidagenidewuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5812/6245/files/59482933280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5496/2590/files/calculus_for_dummies_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3356/5096/files/42943501545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1383/2613/files/cephalosporins_classification.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2c6c1_07de6c9da1b246f188cd45a62b5b0dc8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/868f76_cec181cb743140cea0d3727e2ea243a4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cf5aa9_3b0d7c2512a6478a98f141d9760ac3ff.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_off000069af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AF 5364 bytes
SHA-256: c618ff971c08059c705c96d30fc15fbd056d16198cb37ee2e98aacf0ed720465
font_01_sfnt_off00007bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 10488 bytes
SHA-256: b90e3a3ed5bb1d93851bc153eadbe6f2eb6406371cdea54b6cf2afe9134d52ae

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