Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b5890435067a56…

MALICIOUS

PDF

37.3 KB Created: 2020-08-31 01:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 133d7026e5ba5a5ffe43df874d9c55b1 SHA-1: 40763fd2deacc45ae40f81a0afcc3dafbb779184 SHA-256: a8b5890435067a56e83f934cf0fc160798bd5e012266c1406a6582fdbc4699ba
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, with a critical heuristic firing indicating a PDF link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=koss+c928+manual, which is flagged as a malicious redirector. The presence of numerous other links, many pointing to Shopify and static.usrfiles.com, suggests a link farm designed to obscure the ultimate malicious destination.

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=koss+c928+manual
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/beyond_good_and_evil_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/goviwofiratipibog.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/microsoft_releases_2016_corporate_social_responsibility_report.pdf
    • https://cdn.shopify.com/s/files/1/0450/6091/5350/files/employee_absenteeism_project_report.pdf
    • https://static.usrfiles.com/ugd/b8c837_46dc87ecc9b048e3a764ab1bcb320ec0.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_75049e07fcd1476aab40c4eaf817c031.pdf
    • https://static.usrfiles.com/ugd/a640e9_00019a0d51db40cfa9599a9a6d19101f.pdf
    • https://static.usrfiles.com/ugd/111c46_daefa0f610f1426692eda8b2f69fa81f.pdf
    • https://static.usrfiles.com/ugd/18f527_45235f3a1baa49a680044592beb84697.pdf
    • https://static.usrfiles.com/ugd/09273f_31810488fc354c9294584d574afc8aa6.pdf
    • https://static.usrfiles.com/ugd/fe83c3_61a7461654464e59bb51f8d35a7f70f1.pdf
    • https://static.usrfiles.com/ugd/67f5f7_8724e8ff9f9941cba7baca7db01ed84a.pdf
    • https://static.usrfiles.com/ugd/b8c837_545b203e077f4949b197755b78cd63af.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a163b0170c94cfbb48ce232486b0802.pdf
    • https://static.usrfiles.com/ugd/2e16aa_017887fa5ab348c9ab351cc1641c62ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_614345f4df674ab5bdd4266c150813d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6842c2b36a42404caf4783df198271e6.pdf
    • https://static.usrfiles.com/ugd/a01749_4a2e517933c04ada9633e960a99b48ea.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_off00004fe0.bin
16055cf9d8b79244c7df094018d91d6a3b770864c75f76069d6985b15be0cdf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE0 5300 bytes
font_01_sfnt_off000061cd.bin
e4bf560e43347b9c758e212bc25b3ab2e98c55db52dadc8eb55b6fd76a6b08bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 12012 bytes

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