Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d3fbdee5f829e0…

MALICIOUS

PDF

42.0 KB Created: 2020-10-25 08:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 372e33107177d33615d948abaaf6b7d3 SHA-1: 90b59e14e18bd06f2627943b376f7ea784af255c SHA-256: 86d3fbdee5f829e06599bf46b8ed934fe09d62f466d34b5e6909d7b882b0cb91
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/123?keyword=epic+seven+sol+guide. The document body, though heavily obfuscated, contains a reference to this URL, indicating the primary intent is to redirect users to malicious content under the guise of a guide.

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/123?keyword=epic+seven+sol+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79748a38-1029-498f-827d-730ae8b5bb3b/17553734082.pdf
    • https://uploads.strikinglycdn.com/files/98aaec30-7d08-4eca-9a0f-0db7dba67cc3/99099540112.pdf
    • https://uploads.strikinglycdn.com/files/4eb2c743-4725-43ad-a815-c380efcc1656/69392388903.pdf
    • https://uploads.strikinglycdn.com/files/a482ad3f-3766-4cd1-b817-feb3b13369e3/podalopijison.pdf
    • https://s3.amazonaws.com/xakapudakadu/gelewavirujikifar.pdf
    • https://s3.amazonaws.com/gedimuta/architecture_vocabulary_list.pdf
    • https://s3.amazonaws.com/gewisetug/caderno_caligrafia_para_imprimir.pdf
    • https://s3.amazonaws.com/xanebavifamopez/20780054163.pdf
    • https://s3.amazonaws.com/tadovu/wilfred_owen_dulce_et_decorum_est.pdf
    • https://cdn.shopify.com/s/files/1/0479/6855/1068/files/squirrel_hill_cinema.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/making_history_skills_book.pdf
    • https://cdn.shopify.com/s/files/1/0266/7731/3733/files/20081347727.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9082/files/destiny_2_a_map_asunder_nessus.pdf
    • https://s3.amazonaws.com/lanubili/41222455766.pdf
    • https://s3.amazonaws.com/jamokaroxoj/modul_akuntansi_biaya_mulyadi.pdf
    • https://s3.amazonaws.com/sugaguxagu/casey_at_the_bat_questions_and_answers.pdf
    • https://s3.amazonaws.com/wajibile/panduit_cable_tie_mounts.pdf
    • https://s3.amazonaws.com/kavitokolezub/multiplication_worksheets_year_4.pdf
    • https://s3.amazonaws.com/wazotojemov/84225574320.pdf
    • https://s3.amazonaws.com/pewibim/hand_washing_steps_pictures.pdf
    • https://s3.amazonaws.com/kavitokolezub/understanding_and_using_english_grammar_3rd_edition_answer_key.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_off0000656d.bin
f59ddac8b336857180083e706ea0b2ef3c23f7a74491b5f636466a61450089f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 4952 bytes
font_01_sfnt_off0000766c.bin
247ada1631df80a7702213e1d0cde44b5b14e0831f0816a56a624998d8bd899e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766C 10824 bytes

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