Malicious PDF — malware analysis report

Static analysis result for SHA-256 33da413889df7ccd…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 17:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24aee624e07b759b38746930970814d7 SHA-1: 6e29ee280b0af2580c3d2c44790d1c4224f48db1 SHA-256: 33da413889df7ccd71dd3da75f929dbdde08a5b10fddfc5b7ad21e56c8514b59
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates a malicious redirector link, and another identifies a PDF link farm. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=biblia+catolica+pdf', which is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users into clicking these links, potentially leading to further malicious content or downloads.

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://ttraff.ru/pify?keyword=biblia+catolica+pdf
    • http://files.beaconofhope-africa.org/uploads/1/3/1/6/131606965/kamedafemu.pdf
    • http://files.scubajohns.com/uploads/1/3/2/8/132815807/3512868.pdf
    • http://files.rotaractpac.org/uploads/1/3/1/4/131437755/wagasopa.pdf
    • http://tesojag.loutildelapub.ca/uploads/1/3/1/6/131636612/9514287.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/articles_dfinis_indfinis_partitifs_contracts_exercices_corrigs.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/70587865378.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/machine_language_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0438/1782/8512/files/44098731351.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/sujokoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1023/files/leibel_and_phillips_textbook_of_radiation_oncology.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/45798769107.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/steven_s_skiena_the_algorithm_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/fobemedapavelozob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7206/files/english_reading_practice_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/rogesinodopi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/bugeko.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/cost_accounting_multiple_choice_questions_and_answers.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062eb.bin
be280a3c633ed4e2d2d4af4b112b9335a524f0ca32d6cc9d48fbf2544ffd024f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 5064 bytes
font_01_sfnt_off00007439.bin
21fedc0e574b0a6b28070801e4b67ed318c21b3c353570528131f69d1d4005f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7439 10532 bytes

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