Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dce23c986b7c97…

MALICIOUS

PDF

48.2 KB Created: 2020-09-01 19:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee2f1d3ee1a7ce400b5d61bf796db48f SHA-1: f5a45a02698434897fd4fbf6ee470c226db0a82b SHA-256: 77dce23c986b7c97948cb09173051138bb499b1ed0008f5bf65bf7db2a4fe3f5
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as an offer for free software. The PDF also contains a large number of external links, many of which point to benign files, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead the user to harmful content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=free++whatsapp+for+blackberry+q10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_170c03d1a7c44d7d85f26e262d8a86b0.pdf
    • https://static.usrfiles.com/ugd/60933b_043bb4e8e4a74ca49d4f96bd93e59a00.pdf
    • https://static.usrfiles.com/ugd/cec570_88a823e1cd724e08bcced3328792d7ef.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/pujegebudana.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/51209457084.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/31367002384.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/a_programmer_s_introduction_to_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6675/files/wumaxetuwulas.pdf
    • https://static.usrfiles.com/ugd/aef5b7_c17374182bd7454fa5da6306ad14780d.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_5ae1a1a0ebd746dcb6b3f8758f7bae08.pdf
    • https://static.usrfiles.com/ugd/5a4aad_88f6d36b2b9d42efb40eb59466f9a1fd.pdf
    • https://static.usrfiles.com/ugd/aef5b7_68b0dd06ea74488ea703d0d2942f21e9.pdf
    • https://static.usrfiles.com/ugd/ef253e_5b3e4604f6e9406eb96751d478ed154c.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_off000071e1.bin
d7d013408685d1bf1dc1dee1d90893ea0daaa0e4e5db9584292ef4d00e01cff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E1 3304 bytes
font_01_sfnt_off00007dc5.bin
c93bd39e2cff405c0268c67b44a064aaacc9b8c22f65dc1475cb6401b79b8dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 5776 bytes
font_02_sfnt_off00009191.bin
ea8f048b1425cb8075906bf0b706ef028984d6dc18c8794788ef4ee8601e5107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9191 10008 bytes

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