Malicious PDF — malware analysis report

Static analysis result for SHA-256 41674815305c62de…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 11:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f09f70d0222b06aa0b870fcdfc66bba SHA-1: 2b16b01ce90b6274bc392ee79bd8fec37f3b8a26 SHA-256: 41674815305c62de25b93961c5a4191ca3f9b4ec284cdc3ff5a2ab2779367aeb
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a PDF link to known malicious redirector infrastructure. Another critical heuristic identified a PDF link farm, with numerous links pointing to external PDF files. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to lure users to 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.com/wix?keyword=cool+math+games+factory+balls3
    • https://cdn.shopify.com/s/files/1/0430/2215/5930/files/gakuliguxazapidelifij.pdf
    • https://cdn.shopify.com/s/files/1/0434/2113/9096/files/employment_authorization_form_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/free_online_hidden_object_games_no_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/21754261193.pdf
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/minecraft_parkour_maps_for_xbox_one.pdf
    • https://static.usrfiles.com/ugd/934fc3_e3144525bfa04ec2b5656c2522ce47f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4847b2eb03a04dc78289e67ff1010ebc.pdf
    • https://static.usrfiles.com/ugd/dd4472_2e65a27de3714a5ca598242657218e12.pdf
    • https://static.usrfiles.com/ugd/b8c837_11aa4c9333a142c0af0c7741f0e27970.pdf
    • https://static.usrfiles.com/ugd/ab922d_9d5aa3acddc14539903436349e2d7ce0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbb8c5f67c64c6e89d56df9f1fa27d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_762f175373ab44aab00df0b588113560.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_49215446b5474558b65b08d30ae6b7eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_01138b9847b64762b35bb299ae6ebf02.pdf
    • https://static.usrfiles.com/ugd/40512e_2b5c8004368349ac80a3d6f78c3e4eed.pdf
    • https://static.usrfiles.com/ugd/8b97dd_40086874d4884c5ab170d88f96b7375a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d561bd7e3df411cb018252ae87adcdf.pdf
    • https://static.usrfiles.com/ugd/82e28d_d0525337e4f8486caca34214da508224.pdf
    • https://static.usrfiles.com/ugd/69695d_99abfb364b6849c5a2fca71951ea282e.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/
    • https://static.usrfiles.com/ugd/69695d_99abfb364b6849c5a2fca71

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000676d.bin
cb44c80da09824f2a7990adc182ac2dc8f6e210622545c2ad024eea21b721481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 5604 bytes
font_01_sfnt_off00007a64.bin
403bb33f66c4053e6d60fbacc76bdc8fe47aaac8ada9adb99f954d0a9797c4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 10212 bytes

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