Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8100235fa7a4d4…

MALICIOUS

PDF

37.3 KB Created: 2020-08-31 03:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa9e039632b7d854e02943f9c8cfa9ac SHA-1: 7e4feb511775ce7951a9812275e74d30b17ca29d SHA-256: 0d8100235fa7a4d4000c678e930a82e4db78d079d3a9c1fbc6dca7060c3c5fab
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous benign-looking PDFs, but the primary URL, 'https://ttraff.cc/wix?keyword=prepositional+phrase+activities+for+4th+grade', is identified as a malicious redirector. This suggests the document is designed to trick users into visiting malicious infrastructure, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=prepositional+phrase+activities+for+4th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7056/9113/files/53936050878.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/4416467983.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/60476324637.pdf
    • https://cdn.shopify.com/s/files/1/0434/5364/4966/files/history_of_cosmetic_surgery.pdf
    • https://static.usrfiles.com/ugd/0d2908_fab7413a7ae64f94b6c7d566a73c87d8.pdf
    • https://static.usrfiles.com/ugd/3aca14_7096a95c879d466c9705fac2ac414eea.pdf
    • https://static.usrfiles.com/ugd/b8c837_040c7584a9a24ecc9a3cd31e372d9080.pdf
    • https://static.usrfiles.com/ugd/e5a943_fa07803d9738452795c7960b3c81ae47.pdf
    • https://static.usrfiles.com/ugd/5e8de6_a6fa58fc491c41b4a8afccac01312004.pdf
    • https://static.usrfiles.com/ugd/10b11f_e97d20621a4348e7bf99ff6e616603b9.pdf
    • https://static.usrfiles.com/ugd/5438e3_616662c6b7fc4014872eb94fd9846cf2.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/esma_guidelines_remuneration_ucits.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/58520269867.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_off00005212.bin
c970a00160b2e29da885fdfcc81d3ff48c121949836915507e32ba18229fcbca
pdf-font-stream PDF embedded font (sfnt) at offset 0x5212 5568 bytes
font_01_sfnt_off000064fd.bin
9e52c1940d23ed840ccbade0adf28fd74245b64a358dc13a792b3fb6773465be
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 10396 bytes