Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f9474216c0ebad…

MALICIOUS

PDF

46.9 KB Created: 2020-08-13 15:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59149a44de5dec67047f6fcd035c021a SHA-1: e44ff5edda0488733906071c388933aa0ad43a53 SHA-256: 10f9474216c0ebad49dfdf11ca6e7a261be34f8c27487af4cb228b2fed2bf8d2
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=captivi+plautus+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to redirect the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=captivi+plautus+pdf
    • http://legax.kauffmanfraser.org/uploads/1/3/2/7/132741334/zowikada-rafapufupoter-didobexawajeve-notatarizobezok.pdf
    • http://zipowol.cattailcreative.com/uploads/1/3/1/4/131453329/4260edb29f0.pdf
    • http://files.interlakescommunitycaregivers.org/uploads/1/3/1/3/131384286/muduxafo_vajozodubaxuv_xorip.pdf
    • http://files.jandabendquilts.com/uploads/1/3/1/6/131606876/50e71188df4.pdf
    • http://files.thenextstepridingservices.com/uploads/1/3/1/8/131858287/6825764.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4994/2168/files/abas_iii_scoring_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2523/files/zamutizasitovabudozatafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4711/6185/files/learning_and_behavioral_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/statistics_probability_questions_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/vigadejipovifimopus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4149/files/58408649126.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/73649834936.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/ap_scert_text_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1362/files/88488608687.pdf
    • https://cdn.shopify.com/s/files/1/0429/3735/2358/files/93403980359.pdf
    • https://cdn.shopify.com/s/files/1/0433/1601/9355/files/jack_lalanne_juicer_manual.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_off00007770.bin
aaed1bea1c9bdf16f1901e7e0389fe56ea2269afb9e679c6fd090798264383a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7770 4904 bytes
font_01_sfnt_off0000883b.bin
1906bd04097ff979c694783324eecd2baa6c3d58773132ed80a78d7389bf9a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x883B 11104 bytes

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