Malicious PDF — malware analysis report

Static analysis result for SHA-256 7424d667992ae267…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 00:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57211cc1e2a5f3aff242673c25f92816 SHA-1: 45bc77c3e152a499638049718a6011ad31da4d4a SHA-256: 7424d667992ae26720b25a3f0d8fbb26f150a71a0a921a07235f2d9970a8d50e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a download button, aiming to trick users into clicking it. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=why+do+torrents+download+so+slow
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/2249/5389/files/uptet_answer_key_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/wiwarakipodoworiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/komotuvapepulebuge.pdf
    • https://cdn.shopify.com/s/files/1/0439/1115/1768/files/31685995918.pdf
    • https://cdn.shopify.com/s/files/1/0440/3675/1525/files/panera_bread_printable_menu.pdf
    • https://static.usrfiles.com/ugd/b8c837_535d5e5d905d4592bf1b433bcf1437bc.pdf
    • https://static.usrfiles.com/ugd/286fb8_49935025d2e04c88898f1736ba4c4413.pdf
    • https://static.usrfiles.com/ugd/80c1db_7f05dcf378e84724ae8fc37cc82dc9be.pdf
    • https://static.usrfiles.com/ugd/c1108c_7ec76627699a4bcf9c255faacd895382.pdf
    • https://static.usrfiles.com/ugd/b8c837_737c091a25834ef7bf01ab27edcd084b.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_775ae8f727f547248d6197dc7f16c7f8.pdf
    • https://static.usrfiles.com/ugd/87a178_6e20d39669624041accb6b27dfcfb9f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_290bc459e8dc47b8aea4d3692838abe0.pdf
    • https://static.usrfiles.com/ugd/d54300_0f9d2774ce384a59bbe9caba604f92f7.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_off00005cb7.bin
c9428a2e8fd4ee4c166c98999d386b4d23a5bb006a74b8392a758771ec56bb81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB7 5120 bytes
font_01_sfnt_off00006e37.bin
e1f754ffbaec591260c8031cdb53e467ad1980e127548b62919ab932b3a304f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E37 13132 bytes

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