Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c81782dee79a48…

MALICIOUS

PDF

46.8 KB Created: 2020-11-05 08:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d677734c9f1721feb6dc3a9008c8fa8c SHA-1: 5a8bd64a795880cd895e60343a307013f3a40cc7 SHA-256: f4c81782dee79a4809ea02d01d8ffd4c79bae140f0709656a561cb95f9231113
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://gettraff.ru/aws?keyword=lg+smart+tv+remote+app+for+iphone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fa0281d989c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5f8d6179386e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f95d2f106bd7.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/nebir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_5f950d8a28bf9.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
    • https://s3.amazonaws.com/febopa/74597453705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a74c8d-fa1e-432f-98bb-83970991c80f/15526927810.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/skewness_and_kurtosis_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/6th_grade_reading_comprehension_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154d6374-90be-482b-88ab-95d97e2e7a27/reviews_on_bio_tech_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/english_reading_text_b1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fcd149-16be-426d-a82b-f94a0448e965/87947559299.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/newikosaxedamezul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef97411e-a953-471c-979b-3f0a2a6099f1/kokixatibuzesode.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAD 5072 bytes
SHA-256: dd62de533cd599c8b536d9b89b2730cd8b4eb97215a44badd0cb3ff3791b723a
font_01_sfnt_off00007bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCC 10532 bytes
SHA-256: 0a3b3f54aa8c5b4bf4400b702e54246219f652f048a06262e483173361028458
font_02_sfnt_off00009fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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