Malicious PDF — malware analysis report

Static analysis result for SHA-256 b442976ce1bc614f…

MALICIOUS

PDF

44.4 KB Created: 2020-08-06 17:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 265920cb81e09a8e2b05cd23a5ddd29f SHA-1: ffa53e4458ed7b36924cbeaa9be4da60d736805f SHA-256: b442976ce1bc614f428065dbaa37524ea87561a5baaf929b0bb4c42a06e9ff4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though garbled, includes the malicious URL and keywords suggesting it is a lure. The ML classifier strongly flagged this PDF as malicious, indicating it is designed to redirect users to malicious content.

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=butterbrott%25C3%25BCten+sterne+vorlagen+pdf
    • http://files.mountainairdance.com/uploads/1/3/0/9/130969505/d2539a6f29c93b8.pdf
    • http://zefevumel.mtlclownfest.com/uploads/1/3/0/9/130969204/dedus.pdf
    • http://files.hbsconsultingsolutions.com/uploads/1/3/2/6/132695601/nusetekiwazapoxeg.pdf
    • http://files.gavinmleighton.com/uploads/1/3/1/3/131398143/noresotetituzubum.pdf
    • http://files.runawaytheater.com/uploads/1/3/0/8/130874676/7804763.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/kajeguvedanubimolejuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4105/4105/files/nekawijototuwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/job_letter_of_recommendation.pdf
    • https://cdn.shopify.com/s/files/1/0448/2033/2705/files/livros_sobre_liberalismo_economico.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/cds_exam_preparation_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/76913594068.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/bm_tron_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/fazesobezilewixonabugane.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/template_by_ozami_internet_directory.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/vurotazepivobogulonerawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6794/8708/files/da_capo_anime.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_off00006ca7.bin
810ed0e29040979ca04e7b81299a80f0f8a67f96a87eb592bf120812ace9dc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA7 5576 bytes
font_01_sfnt_off00007f7b.bin
11457c11e3fedd9930cea91a2f09be45716e63ab7b385927fdb9ecd2c1e13ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7B 10604 bytes

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