Malicious PDF — malware analysis report

Static analysis result for SHA-256 55aa8087a8d39d3e…

MALICIOUS

PDF

83.1 KB Created: 2021-03-18 10:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 641ffdb996cb6fb27d3df899a4a8c242 SHA-1: 52c1c3677a057e62470d1bf92b1f0ea8ba7adc06 SHA-256: 55aa8087a8d39d3e05f368db3a61af64f684d4159d493b02973c24f781ca6d71
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains keywords related to game hacks, suggesting a lure to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mezovuduw.ru/wix?keyword=dream+car+racing+hacked+unlimited+money+google+sites PDF link annotation
    • http://kalukoroduro.mygamesonline.org/oxford_dictionary_synonyms_and_antonyms.pdfIn PDF document text
    • http://kibesamifi.getenjoyment.net/supigofuwu.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/xexanadija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_5fe79af70fb35.pdfIn PDF document text
    • http://com-copyrighit.com/toyota_yaris_sedan_2007_dimensions9q6bz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_6032739824ed4.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/adenite_equina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fd344bc9992d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_6035877897428.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/84340919795.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/xididezifijuvasamiw.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/does_artemis_fowl_fall_in_love_with_holly.pdfIn PDF document text
    • http://temppicture.xyz/77691083122rz8qz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_60234628dd2ad.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/the_gift_of_the_magi_commonlit_assessment_answers.pdfIn PDF document text
    • http://mastera-saydinga.ru/boy_scout_ranks_by_age8h11v.pdfIn PDF document text
    • http://biotringel.shop/rududafikerigakuwepejatujdsx00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de029686-85b5-415a-bf9d-343a70579170/world_of_warcraft_chronicle_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c8c80a-0853-424a-8db4-8303535eab21/vogatamefurunebib.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/will_argyle_diamonds_increase_in_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00229726-f84e-4d5a-acf8-a44498dc1087/how_to_change_code_on_kidde_keysafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae25150-2329-42e9-a764-703ee89fb542/are_wii_games_still_available.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/lirobaxiwunudu.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/ranovoja.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_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 5516 bytes
SHA-256: 143f885135d20a8fe1eb5f6861225da99554023d18f4ae674ae343eaf06073c7
font_01_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 11164 bytes
SHA-256: 075d9b37ae0741a3ea1ccf240c13c87114365a36d34b52be09cdfe6d30fcd547

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