Malicious PDF — malware analysis report

Static analysis result for SHA-256 64453a9b6a4b3a46…

MALICIOUS

PDF

45.1 KB Created: 2020-08-31 05:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad6d6d150d9fd579eaa5c85b3a5ee085 SHA-1: 9f6068976f59f705c3c6959c5c354ea1f70380b3 SHA-256: 64453a9b6a4b3a46c93708cefd8e7e16fb6625499981fb4a8ff1251e5801b10c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a product manual. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL.

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=currys+essentials+dishwasher+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/a382ee_c52fa9f9b7604ca58fa6ebce5b949248.pdf
    • https://static.usrfiles.com/ugd/b8c837_a409acdc255f47debc86f2cbc47a36cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eb3c54016d04d24ab1ab29580d5a40b.pdf
    • https://cdn.shopify.com/s/files/1/0443/4313/2316/files/cello_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5489/files/gokasedo.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c0e2677d264bdfb97c9b6145d5f366.pdf
    • https://static.usrfiles.com/ugd/4c1554_64db6b9447044b2fa18526419b0ab034.pdf
    • https://static.usrfiles.com/ugd/b8c837_82385f9d59ed4428bca736db4adbc6de.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_23d3347e32654a2ba7141824b24fb94a.pdf
    • https://static.usrfiles.com/ugd/c3f88d_9ae8c64ea8ce42af93038a1d93c25c3d.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6503/files/pointsprizes_hack_generator.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/safuwunebiden.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663e.bin
0ba82f32615cbf05db3b4bfdb2368cb7ba304b8b865ad6f9d650c877cc2e1370
pdf-font-stream PDF embedded font (sfnt) at offset 0x663E 5052 bytes
font_01_sfnt_off0000774b.bin
69960c25f8b720d82538251a340817ed4cac9653fe76654df8d88a0ada590f44
pdf-font-stream PDF embedded font (sfnt) at offset 0x774B 10144 bytes
font_02_sfnt_off00009964.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9964 4324 bytes