Malicious PDF — malware analysis report

Static analysis result for SHA-256 832bc26f15fba6e4…

MALICIOUS

PDF

39.1 KB Created: 2020-10-28 09:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08ef4be097fba992166fc31130290233 SHA-1: c1ba3e311e0ba271c08215d9fbc780017da5f517 SHA-256: 832bc26f15fba6e4ce75cc07ba78acae8deb08ecd15d0e2a217aa6ab4bba82e3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify and Strikingly domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://cctraff.ru/strik?keyword=adams-friendship+area+school+district'. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirection attempt, likely to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=adams-friendship+area+school+district In PDF document text
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/genuzenemawiwo.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/besosuror.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/1/0496/7107/8052/files/slang_for_drunk_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8281/2066/files/hp_elitedisplay_e273q_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1535/4543/files/skullgirls_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3562/5125/files/bosetanixumaname.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2161/3241/files/digital_world_evolution_mod_apk_v1.3.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01c9076-2219-4d48-b7e4-8b124e5aa68b/precalculus_with_trigonometry_concepts_and_applications_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbfc843-9255-44d3-94e9-0ca195e57582/36420019521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6522/5628/files/geometry_dash_meltdown_apk_hack_todo_desbloqueado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7130/0268/files/star_wars_ccg_card_list_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/little_alchemy_guide_human.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4387/1643/files/hyde_park_christian_reformed_church_chicago.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/pearson_physics_textbook_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/28543106165.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/javavageximelibirokazo.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/libro_de_alejandro_dolina.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/piano_sheet_music_with_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc9d19c-fca2-4844-8222-ac732c81c0c8/48958071077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac23ccbc-471e-4b61-b255-dc744bb7fa10/how_to_build_military_grade_suppress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1f43dc-6605-4d2d-9ae2-0dd292863fd2/1223287339.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_off00005a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 5416 bytes
SHA-256: 717b7a5c5e6c7b6efb930d597a5e5c424d3d7bb7fb2672378cc227f1ad52f405
font_01_sfnt_off00006c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C44 10284 bytes
SHA-256: f68003ab6e9267c45dc3e3ae657886c3a439689f62127c90f57ed295a9961cf5

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