Malicious PDF — malware analysis report

Static analysis result for SHA-256 185123e93e2bff6b…

MALICIOUS

PDF

46.3 KB Created: 2020-08-31 08:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d16e175a065161f8b2a913d40ed40fd SHA-1: 1b5e16c56b094aa4a8e9f12a89453190a28eeea1 SHA-256: 185123e93e2bff6bab1d00591d814954fecaef7e10dbba9fe7907b6c9ab4817b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent, likely related to SEO manipulation or hosting malicious content via a link farm.

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=7.3+idi+glow+plug+controller+relocation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9ff9b8_7bdfd9be30524dbcb7896b3cdbac5429.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89481e684a14465a2f29f9b678df186.pdf
    • https://static.usrfiles.com/ugd/599f1c_3d69412659334c0986c35bcc51fb0aca.pdf
    • https://static.usrfiles.com/ugd/8cbfce_37a9d6c8e8d84b24a84f7f48b046bd32.pdf
    • https://static.usrfiles.com/ugd/1a89c8_20629bf0e58948c29616b5178be01be6.pdf
    • https://cdn.shopify.com/s/files/1/0457/6775/3894/files/emulator_phoenix_habbo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/99823577994.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/44238443872.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/92194386988.pdf
    • https://cdn.shopify.com/s/files/1/0438/3955/3696/files/daxetekesararedejeni.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6661/files/tewudopo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/bear_ears_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/9464/4638/files/analytical_reasoning_tips.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007644.bin
ccf10e153864671b4c6c12d6d70f907b894c6c24414d74b78ec8027ada159579
pdf-font-stream PDF embedded font (sfnt) at offset 0x7644 5336 bytes
font_01_sfnt_off00008890.bin
720aad02bd54fce9292cab92772757705fd789eff854e282c9d4a773c2b756da
pdf-font-stream PDF embedded font (sfnt) at offset 0x8890 10396 bytes