Malicious PDF — malware analysis report

Static analysis result for SHA-256 e936b5f6a1f638b8…

MALICIOUS

PDF

45.0 KB Created: 2020-08-30 15:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38490bdc60aa7ab3109d55ffce705f01 SHA-1: e57c9d19d3a6936e42430bb0c173014432df3785 SHA-256: e936b5f6a1f638b810d6520459953e7b3dfb223b514fc042eb7e046d8214fb4b
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a direct link to known malicious redirector infrastructure at ttraff.cc, which is used to lure users with search result-like keywords. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL and keyword used in the redirection attempt.

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=timing+chain+guides
    • https://static.usrfiles.com/ugd/3b7182_1a82704dc1fb48569fbf80467be9ff96.pdf
    • https://static.usrfiles.com/ugd/e1d12c_5bd0e3c797db443e80cab25aff8cb955.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_c5baca937dc94da994bfd715de8b202e.pdf
    • https://static.usrfiles.com/ugd/585b1d_9de374e7ec0e44e39c51a2977449780f.pdf
    • https://cdn.shopify.com/s/files/1/0440/7925/1608/files/cholera_epidemiology.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/voxurixotolemod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0137/9996/files/byzantine_art_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/92077832389.pdf
    • https://static.usrfiles.com/ugd/ca32a8_1c8ac916b5b540d4a61888504e96471b.pdf
    • https://static.usrfiles.com/ugd/067ecb_0f46c8b83c2e491aa9d9a3fdfc8196c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5454b90080f4979982861724bee7770.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed59e422ec054ee081e18de4f03e6c5c.pdf
    • https://static.usrfiles.com/ugd/0c4177_f07e5edc0e934462b8b3328d48b4143f.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/nupopawovodet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/xufuruwupi.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/17970742109.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/40825657026.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_off000071c6.bin
e4b99eef4ddb4abd18e473c26c839f545c0344a63bbbf5071b077444a945f40d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C6 5172 bytes
font_01_sfnt_off0000832a.bin
cf4d82c3bea4de144f8740a410c1a433f3255fd243592c79cc9e204834e6cc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832A 10544 bytes

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