Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bce5b5d119d767…

MALICIOUS

PDF

41.3 KB Created: 2020-08-15 00:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20cf8aa827d191c6c01560546d3b6894 SHA-1: 8d2806d34000b24a1b06ff99bd2470e88c000014 SHA-256: f0bce5b5d119d767be1dee7ed0d7c1f6bffe738603547c139e898731be835477
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.com/pify?keyword=bigo+live+free++for+laptop'. This indicates a social engineering lure, likely attempting to trick users into visiting a malicious site under the guise of a free download. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm for SEO poisoning or redirection. No scripts were extracted from this sample.

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.com/pify?keyword=bigo+live+free++for+laptop
    • http://files.geckoboa.com/uploads/1/3/0/8/130813769/b9df3d760.pdf
    • http://vadirudu.seesparkles.com/uploads/1/3/1/4/131453858/8383939.pdf
    • http://files.ohanahomeschool.org/uploads/1/3/1/0/131071063/97721.pdf
    • http://files.nonstopinternetshop.com/uploads/1/3/1/6/131607029/bepikiwijavikew-bulaxatotafimad-wenogawuvijene.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/70228714280.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/10th_class_biology_book_english_medium_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2447/4531/files/79957448553.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1144/files/install_docker_on_windows.pdf
    • https://cdn.shopify.com/s/files/1/0433/9200/8357/files/prl_update_sprint.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/popuxavariwarolaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/vepimokulumagaxisijijeje.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/nuzakodemusuvopub.pdf
    • https://cdn.shopify.com/s/files/1/0433/8899/3703/files/ford_6._9_diesel.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_off00006485.bin
42c83102164770a068dca9ec3d8373b334b9d2b9a69c3120ff5fdc462cd5ba98
pdf-font-stream PDF embedded font (sfnt) at offset 0x6485 5000 bytes
font_01_sfnt_off000075a1.bin
5b5c00c3a072c826253915989b18cb6c08611c7bc43c62e45144c38d3d1706bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A1 10216 bytes