Malicious PDF — malware analysis report

Static analysis result for SHA-256 54db76ab47983b25…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 15:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f291565ed6f697e508b309da567a7419 SHA-1: d67e5a1890688bc07c866d89052d9eae42355635 SHA-256: 54db76ab47983b25ab661aabaebf647250aa068e46f80b1489def4ebf2f1fbfc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link farm and a primary redirector URL pointing to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting the intent is to redirect users to potentially harmful content under the guise of a book download.

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/wix?keyword=caballo+de+troya+libro+jj+benitez+pdf
    • https://cdn.shopify.com/s/files/1/0429/9934/9407/files/essence_anatomy_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/67049758278.pdf
    • https://cdn.shopify.com/s/files/1/0434/8051/4726/files/top_customer_service_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/zaguzexabifudewopasi.pdf
    • https://cdn.shopify.com/s/files/1/0449/3400/4891/files/rekefivuwonuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/halo_minecraft_skins.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/photographs_and_memories_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/98147188921.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/tamilrockers_attu_hd_movie_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0438/8634/6408/files/mefunejefazoguwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/tepepigonizumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/blues_chords_progression.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9497/files/asientos_contables_mas_comunes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/55936962466.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/57472998460.pdf
    • https://cdn.shopify.com/s/files/1/0430/8356/3162/files/66247595423.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/1/0431/2875/0241/files/574729

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006871.bin
b2118c5b96b5054abf29533a191424874186d6c71ed779dcd5a10c5c6e874469		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6871 5128 bytes
font_01_sfnt_off00007a02.bin
a755bc1ff7742368fd81cb0e9106365dfaf41506d3eb0398296c67b0ef686392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A02 11248 bytes

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