Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdfc5de54b4619d…

MALICIOUS

PDF

49.9 KB Created: 2020-09-07 17:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b61ec725d15b5ae4c60d841fe395571 SHA-1: 82881491e6e7f7e4088f6acd16422e39a858e178 SHA-256: 4bdfc5de54b4619d1a71fdc89e29fcc78e780f9c910f511d3a16d41055c6d1d5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=aomais+go+30w+bluetooth+speaker+manual'. This indicates the document's primary purpose is to lure users to a potentially harmful external site. The presence of a large number of embedded links, many pointing to Shopify and static.usrfiles.com, further supports the idea of a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=aomais+go+30w+bluetooth+speaker+manual
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/14854968160.pdf
    • https://cdn.shopify.com/s/files/1/0461/7974/5945/files/56318742360.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/95737875585.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/biker_mice_from_mars_pc_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/62103807526.pdf
    • https://static.usrfiles.com/ugd/6df952_9fc25360db4142f6b31f5d9dcbf48340.pdf
    • https://static.usrfiles.com/ugd/0f1814_a2081bd09ef34199b0342fa6f57faf6f.pdf
    • https://static.usrfiles.com/ugd/b371d9_01775890d7ec489489b4cf5221d50149.pdf
    • https://static.usrfiles.com/ugd/3fb742_6ac8fb0f4a5a431bb57698205449e65b.pdf
    • https://static.usrfiles.com/ugd/221f3a_1dc2123862fc4c15af0ad0aee901131a.pdf
    • https://static.usrfiles.com/ugd/7f16bd_4c28f90f24984315bfa1c4e9740d7731.pdf
    • https://static.usrfiles.com/ugd/2b25e8_36aba5a4803248ec8fc96f4ec4074ec6.pdf
    • https://static.usrfiles.com/ugd/ec0012_b680118f8ce643f9a1189c884ba74c2e.pdf
    • https://static.usrfiles.com/ugd/67e251_463fed4a74454331ab39249ab6a72f93.pdf
    • https://static.usrfiles.com/ugd/b73feb_e6303abd5d4549e29496c31a21ac0897.pdf
    • https://static.usrfiles.com/ugd/b8c837_255a84215a284ca88d45dcb08a210a2e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009fb6.bin
b4384bf544a2dc64f04dfe97bfe23d3737cecd976eb35bdfcec9268c9c80b9fb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9FB6 17696 bytes
font_00_sfnt_off000067b9.bin
6ba594538a54e08c9ebaefc3876f97d38398575f6e0dc5bb260d5c3de375983a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 5824 bytes
font_01_sfnt_off00007b64.bin
db8aeec665e6e541c0e694ae63bc31d82f826e75c8953dc7b547954c90f10156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B64 10532 bytes

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