Malicious PDF — malware analysis report

Static analysis result for SHA-256 a437cffcd444f121…

MALICIOUS

PDF

40.8 KB Created: 2020-10-04 12:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 8099a615837747fd9de379cb4ad15d4a SHA-1: 707f0e154816dc9605e05322c726a2e4281357ff SHA-256: a437cffcd444f1215ec4b377a1b328d2f4fb565f66f546d036c8c504877d406f
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://ggtraff.ru/strik?keyword=top+notch+2+third+edition+pdf In PDF document text
    • https://site-1040213.mozfiles.com/files/1040213/10888048417.pdfIn PDF document text
    • https://site-1041074.mozfiles.com/files/1041074/daratuxezubajixutevi.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/gasenudut.pdfIn PDF document text
    • http://zopusizi.drscottdorsey.com/uploads/1/3/0/7/130739678/1672145.pdfIn PDF document text
    • http://vipejabig.centraloregonfillyourpantry.com/uploads/1/3/1/4/131407572/fimureni.pdfIn PDF document text
    • http://donak.calandraesdragon.com/uploads/1/3/2/6/132683169/lipefaxepal.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://cdn.shopify.com/s/files/1/0427/8019/7031/files/scholarships_for_2020_high_school_seniors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3254/2369/files/39464039525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/garage_door_opener_battery_replacement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6432/6309/files/zinoxova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5168/2454/files/mountain_meditation_jon_kabat_zinn_mp3.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_off00005200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5200 4692 bytes
SHA-256: 0c337530b1e401f50723e51ae7b3453a683a6f4a3969c370b770488da1673f21
font_01_sfnt_off000061e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 12064 bytes
SHA-256: 46e094d745949fb0b85db5bf69bd56195c8f080b1deb53833f29a6366512124b
font_02_sfnt_off000088a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71