Malicious PDF — malware analysis report

Static analysis result for SHA-256 8904f26888300ad4…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 05:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8154702ace99a63bfadef36e432f6834 SHA-1: bb5771c3a87f9f782a2863c599c5c57b0b25fc09 SHA-256: 8904f26888300ad456559fe7046a44abe5014dff3f38bfff33698ec1117a5569
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL and text suggesting a lure related to a book review. The presence of numerous other PDF links, many pointing to static.usrfiles.com, suggests a link farm intended to obscure the primary malicious destination.

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=you+can+win+by+shiv+khera+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_eef65faab57c451da30947b4172d077f.pdf
    • https://static.usrfiles.com/ugd/b8c837_109163e0a77c40919393e58b29782ac3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2c3427f58f145edbda03a8c7c7d935a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88a168183e74e4495651ea79352d3bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab510ceca5b543cf8b782a77f8b8efb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1203834decad448b98ae5f210da8ec49.pdf
    • https://static.usrfiles.com/ugd/b8c837_759d53d6afba4bc0a681aca42b34d0ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_b50cd9a777fe42f19c748b10e8681b3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bce332ee5b64ffbb48fa358c04ce955.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1237/files/kulun.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1029/files/first_anglo_afghan_war.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8522/files/36395734445.pdf
    • https://cdn.shopify.com/s/files/1/0439/9595/5358/files/3536000442.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/52419642280.pdf
    • https://static.usrfiles.com/ugd/b8c837_503930efaa134338ab701eb24487daf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73cfb7d4e44477f809a204966db6af4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f866999989704b5396005953c64bedf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb202433613e44efa46ec4588a2dae1e.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_off000059f5.bin
007986f3c2222e52c04a3765fce6aa2098230abc29a5f850ca070489b4d19d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F5 5276 bytes
font_01_sfnt_off00006bf8.bin
e1de6692973be69befd8a60290ca146be5823c71c6068da459900a9b4e466180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 14744 bytes

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