Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e7a2fbe97bd7c9…

MALICIOUS

PDF

45.5 KB Created: 2020-09-01 07:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa752873cf6823adc309476cf0ea2625 SHA-1: 6d6656150ba5f38613eed098d26a0a6031d103f5 SHA-256: 47e7a2fbe97bd7c93c6e3793cffc4846e2d4d0b09e7ae70c903885c400493159
152 Risk Score

Malware Insights

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

The PDF contains a malicious link disguised as an Android update notification, directing users to a known malicious redirector. The document body and heuristics strongly indicate a phishing or scam attempt. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, suggests a link farm used for SEO poisoning or distributing malicious content.

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.cc/wix?keyword=android+10+update+pixel+3+frozen
    • https://static.usrfiles.com/ugd/b8c837_21cc0cae5a5d426ca3d9d6962460034b.pdf
    • https://static.usrfiles.com/ugd/ef253e_95c74e0ac0bf4df2a9722eb11207eff5.pdf
    • https://static.usrfiles.com/ugd/99afdc_8d7eff986ac94ceb900eaeee7428aab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e0ac82fcabc4627b16f20c7458909b9.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/american_airlines_logo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2448/0416/files/24310397010.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_bf8bb92bb5a349b9bf783838fdd4c4e4.pdf
    • https://static.usrfiles.com/ugd/362633_e834f099691740f89d3667e09df6ba14.pdf
    • https://static.usrfiles.com/ugd/bf07b1_86850b250704425d955462459793da2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3afd7d5d8d3d48d780e46f3371c6f3cd.pdf
    • https://static.usrfiles.com/ugd/1f5cef_cf68cd6ce0e641fab9bfb0ed020f14e9.pdf
    • https://static.usrfiles.com/ugd/b910ae_43799a0326c3467998b7a61a36fcddb0.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_off00006c4c.bin
d81da2480871f30d18d727c26e76edaebfd6d7c986f830aac661c5e2f526281f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 5320 bytes
font_01_sfnt_off00007e8b.bin
6d79a9d87b7bd9ffdb94bd11aad74b0d81c3e6e0e32fcf8a3dc55490f5a7c814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8B 13220 bytes

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