Malicious PDF — malware analysis report

Static analysis result for SHA-256 535f0d42d18c0eb2…

MALICIOUS

PDF

51.4 KB Created: 2020-10-25 03:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4ba64ba49dbe1cb244549ab34733fa23 SHA-1: dc36bbb7d22bf7ab6552137a22d6015e079172e1 SHA-256: 535f0d42d18c0eb2b7057896a19f98208dfe95d3af8dd27417bfc71cf09c462a
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://cctraff.ru/aws?keyword=pdf+of+biochemistry+book+by+satyanarayana In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8762b7a1b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f873f2eab546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5f93e9e56a3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8df0f2ba76d.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/gavexilatuvitaz/genexazifakezuvadusulisi.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/25896586394.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/25609103547.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/81175783037.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/44986095157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0752/7077/files/ets2_bus_game_download_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7295/3761/files/resixawoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3879/1582/files/wogovojemamagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9828/2420/files/53122977871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3705/6415/files/tijipumoxul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1551/2479/files/cost_accounting_question_paper_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/clinical_pharmacy_and_therapeutics_6th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/zetemuxewinegodejanurajo.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/esl_feelings_and_emotions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/mozenebikotogakenelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/tizovafaxupijalaril.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/9324/5349/files/vuzisajaxumakafif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/manuale_di_kinesiologia_applicata.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_off00007ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB4 5324 bytes
SHA-256: 0493448f1a4b8a2a8ec50767f8e0c8cae6aae28565594019074b1cb872363049
font_01_sfnt_off00008ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA0 10836 bytes
SHA-256: c20f1c992a56bcdd81822cedbf8e23c62a061e39349636c31eebcb1c535c2229
font_02_sfnt_off0000b1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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