Malicious PDF — malware analysis report

Static analysis result for SHA-256 79031c8dc83bb11b…

MALICIOUS

PDF

46.2 KB Created: 2020-08-14 03:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d97d00b8f369a3838b35fa55f164fec3 SHA-1: a0062b5ec27ad58e98b572df7294eed45038aa98 SHA-256: 79031c8dc83bb11bdbf9a40142bf05cee61d71932b49f3c7d3a43628428235d8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to host numerous PDF files. One of these URLs, 'https://ttraff.ru/pify?keyword=bollywood+box+office+capsules+report', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to distribute malicious content or redirect users to harmful 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://ttraff.ru/pify?keyword=bollywood+box+office+capsules+report
    • http://files.mrbalint.com/uploads/1/3/0/7/130740252/mozozavile_vizanu_pijupoj_venijaxitidopew.pdf
    • http://files.theflyingcannibal.com/uploads/1/3/1/1/131164446/lunerenuvewonawike.pdf
    • http://ruwojar.sophulart.com/uploads/1/3/1/3/131383548/kijifanisadu_vakakobife.pdf
    • http://files.doubletalkspeechtherapy.com/uploads/1/3/1/4/131453251/b338a4b1413dd64.pdf
    • http://files.michigancourses.com/uploads/1/3/0/8/130814466/1771020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/9429/8014/files/pdf_file_download_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0450/4377/7694/files/ielts_speaking_vocabulary_words_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/65491112482.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/62893986150.pdf
    • https://cdn.shopify.com/s/files/1/0429/5029/5708/files/sherlock_season_3_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1400/files/cardiac_rehab_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/definicion_de_contaminacion_ambiental_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/zibomabera.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/81428350322.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/9801767283.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/75792093454.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4909/files/lofoperujotodul.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_off000069f6.bin
c64c6002b49d327acbd5e0df30dd80622344dcffaa1e8db1d15dc56a374b8b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F6 5600 bytes
font_01_sfnt_off00007d27.bin
14626eaae86b5a5b0facd3d6e0088b0bce52cea63e3367e70bd133b7c80d9b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D27 14844 bytes

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