Malicious PDF — malware analysis report

Static analysis result for SHA-256 370a4584c35a9ac8…

MALICIOUS

PDF

44.3 KB Created: 2020-08-02 21:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd678539875aba9bf5fe717551a101bb SHA-1: 00aae82882d4f478652d57bb389a3ca98245df05 SHA-256: 370a4584c35a9ac810ac2f5fadfff27550a507a94527f87192d8002099eb11dd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver a second-stage payload. The document body, though heavily obfuscated, contains this URL and numerous other links to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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=insane+aquarium+free
    • http://files.chaosdragonboats.com/uploads/1/3/0/7/130739697/remimobavenu_tekanegobifovib.pdf
    • http://vifanalus.lanctotsloveablesteddybears.com/uploads/1/3/0/7/130738914/moxigekod-gujufedudubu-pavekopuxe.pdf
    • http://files.tomdeprisco.com/uploads/1/3/0/7/130739524/9912399.pdf
    • http://files.forestcityhousing.com/uploads/1/3/0/7/130776578/c5bf5131f.pdf
    • http://files.amedicinalmind.com/uploads/1/3/0/7/130775228/tegirexoride.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/85503364906.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/5851102712.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/domupivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/wutokozexewirit.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/90878965197.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/84418360333.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/zulijosonawazovizeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0294/files/discord_overlay_destiny_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/14983407014.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/69463298045.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/29554490905.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/pusafadumefukavajaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/saragelewalekawag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/77043685966.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_off00006f55.bin
78bb495c071c98334d52d0020c928811ab87796a597d7bc0b994375723ba2de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 4944 bytes
font_01_sfnt_off00008011.bin
34cfbf1bcfee527a76cdde2953fbfd3597dcd59c4b035f2adab61eb3f68828ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8011 10720 bytes

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