Malicious PDF — malware analysis report

Static analysis result for SHA-256 31557ff6cb783eb8…

MALICIOUS

PDF

37.9 KB Created: 2020-08-22 15:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 317c4b40da5d07bbed510d081241bf3b SHA-1: ca54a27ed661113cb133d6a78b4bf31172e9713f SHA-256: 31557ff6cb783eb841ecd686fb3b14b8b13ff310642d142185a5da13015b06d2
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as educational worksheets, but the primary link redirects to a known malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document as malicious. The document body itself is heavily obfuscated but contains the malicious URL, indicating a lure to a potentially harmful site.

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=science+comprehension+worksheets+4th+grade
    • http://files.awengworks.com/uploads/1/3/1/1/131164112/7604811.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/vivupofewefima.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/42396853519.pdf
    • https://cdn.shopify.com/s/files/1/0430/7707/5108/files/22314004369.pdf
    • https://cdn.shopify.com/s/files/1/0428/6886/7231/files/greatest_common_factor_practice_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0462/7949/1733/files/majority_report_twitter.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/90389393226.pdf
    • https://cdn.shopify.com/s/files/1/0435/2632/4383/files/pdf_to_mp3_converter_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/27158767905.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_off00004cc8.bin
c080091bc2b2af2fdb16a5d69fae792a23ee03c1142141784ff3cdf504d7b744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC8 5804 bytes
font_01_sfnt_off00006062.bin
27bb813d70b93bc3b8ec07b7144b8f4d556ad51eeca672b705d73df2fe656673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 13696 bytes

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