Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e0d2056cfab2cb…

MALICIOUS

PDF

43.4 KB Created: 2020-10-27 09:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5713ce3cc7a4399f6def0db445ca8b04 SHA-1: 2747596f550533f10f6c9f86c21ec561fb304528 SHA-256: 53e0d2056cfab2cb1abd537e394cac6bae63d7dc75456f7ce07b73807a95b875
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with a "scanning and repairing drive" lure. The document body, though partially corrupted, contains text related to this lure and the malicious URL. The presence of a large number of external PDF links, many pointing to benign content, suggests a link farm used to obscure the malicious redirector.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=scanning+and+repairing+drive+stuck+at+12
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8b6753da7f4.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f8c0759f2ed1.pdf
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f95cc9b84822.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f66eb8dc-8112-4f44-b920-3345d0c1ab6b/44245269042.pdf
    • https://uploads.strikinglycdn.com/files/e16b9336-370c-4b75-8817-ebe7c4086147/lutefiwujakerejevuxofofe.pdf
    • https://uploads.strikinglycdn.com/files/a14807f6-6463-4d01-98c2-5aaa02ec0fdc/mepet.pdf
    • https://uploads.strikinglycdn.com/files/bb3ef0f8-c953-4263-aeb2-da21b1aaf2b3/yajur_veda_sandhyavandanam_in_tamil_language.pdf
    • https://cdn.shopify.com/s/files/1/0500/5764/2152/files/oedema_paru_akut.pdf
    • https://s3.amazonaws.com/felasorarabipis/correlative_conjunctions_list.pdf
    • https://s3.amazonaws.com/tetazino/cours_sur_les_filtres_analogiques.pdf
    • https://s3.amazonaws.com/dazifozixawus/zixineluxubufixulelanapo.pdf
    • https://s3.amazonaws.com/susopuzupure/jojovagujinikejugemebuzav.pdf
    • https://cdn.shopify.com/s/files/1/0503/2417/7093/files/beginning_with_disability_a_primer.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/biluxefejibelusowiwitame.pdf
    • https://cdn.shopify.com/s/files/1/0484/5980/8929/files/film_streaming_gratuit_sans_abonnement_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0483/6612/5219/files/2020_acc_aha_cholesterol_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0502/6411/3305/files/metacognitive_strategies_writing_instruction.pdf
    • https://cdn.shopify.com/s/files/1/0483/9699/2663/files/xelawodomoxobu.pdf
    • https://cdn.shopify.com/s/files/1/0488/5236/9595/files/sample_user_manual_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0497/0879/4013/files/motorola_moto_g5_plus_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/questionnaire_for_teachers_about_students_behavior.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006905.bin
281f087156fb460bd1a1f81dd5c158a5a0a1e36abc9ee6fb73d64ee470577527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6905 5620 bytes
font_01_sfnt_off00007c3c.bin
5b51d90ea34340142b5d6fdb96d80a7365b6dafcaa3f4b611cd181b746770634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3C 10768 bytes

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