Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4291e19db63ffd…

MALICIOUS

PDF

62.6 KB Created: 2020-08-31 09:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db48dc1780f4827d227f2b6bb4b0bf67 SHA-1: 7480f08859a43885d3958eefb1377c352699b28d SHA-256: 3c4291e19db63ffddca2df79e44be9ca60637cf892765bf39881c2c00178c66b
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant number pointing to a redirector service at 'ttraff.ru'. This suggests an attempt to lure users to malicious content or phishing sites through SEO poisoning or a link farm. 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/wix?keyword=hard+english+grammar+questions+and+a
    • https://cdn.shopify.com/s/files/1/0429/1290/7427/files/zolotonidepazurevatonoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/elder_scrolls_online_alchemy_recipe_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/dolefovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/apartment_design_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/api_performance_testing_using_python.pdf
    • https://cdn.shopify.com/s/files/1/0435/5604/4959/files/25896028229.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/43993538731.pdf
    • https://cdn.shopify.com/s/files/1/0464/5352/2600/files/yahoo_finance_api_google_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7428/9813/files/black_bean_turkey_chili_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/xomigewar.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_off0000b862.bin
a41ab393bb5c3d2abe4830cf539e750e6a698041423d8d50400521784795763e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 5324 bytes
font_01_sfnt_off0000ca3e.bin
1678a662c03fcaa82ad81c5b93301baf3f7a348b12f7e72435c7a064965e77d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 10484 bytes

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