Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf438e42656adb8…

MALICIOUS

PDF

34.9 KB Created: 2020-08-10 21:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cfe68e6d64cc3dada735c19720ba666 SHA-1: e18aaad0affa39c9084ae48c6f7cb5efaa011eab SHA-256: 1cf438e42656adb8ddb95442068d60e478cd414df52d72256ed41eb53a8e7d0f
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at ttraff.ru. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic, suggesting the primary purpose is to redirect users to potentially harmful 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=automotive+technician+certification+test+preparation+manual+4th+edition+pdf
    • http://files.winkler55plus.com/uploads/1/3/1/4/131483440/loperedovisef_govefoguni.pdf
    • http://files.perutresdias.org/uploads/1/3/1/3/131379443/6307079e.pdf
    • http://files.vinyliciousdesigns.com/uploads/1/3/0/9/130969150/zapewo_sigonujos_rikokogolipi_vawofimunu.pdf
    • http://paguwapo.thezencaster.com/uploads/1/3/0/8/130874001/4563362.pdf
    • http://lodiradeb.setonym.org/uploads/1/3/0/9/130969356/novexisevesakalupil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/nuzogobepekasixafupize.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7948/files/honda_recon_250_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/37076267566.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/24837295671.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/zukifurovajanopawoxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/gexonufosurudokowef.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9603/files/beloved_part_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/vogoxogukofemebuforo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/catholicism_series_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/2003_honda_accord_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/sbi_personal_loan_application_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/refresh_graphs_in_matplotlib.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/
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/sbi_personal_loan_applic

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047fb.bin
315a19df9546bfd06a24c46b1e48f6eac26ab92bfba2539e81ab97d047e98b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47FB 5532 bytes
font_01_sfnt_off00005ab2.bin
85d4f8ad1654dc4fea2b77e57f2ec750f65b81e01aca77e2849a927aef6a8a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB2 9648 bytes

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