Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a55e01fb3ff3c96…

MALICIOUS

PDF

48.4 KB Created: 2020-09-10 04:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd223f25585ee5427e0faab3c944e8e6 SHA-1: 35123d1b9afa1329b532bdd58dca4ba6d2e19864 SHA-256: 7a55e01fb3ff3c966149a5f6f518b367fcecf0556a3562619de9892f125a954f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one redirecting to a known malicious domain. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this behavior. The document body, though heavily obfuscated, contains the malicious URL and other PDF links, suggesting a link farm or redirection scheme designed to lead users to harmful content. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or redirection attack.

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.club/wix?keyword=fitness+calendar+template+free
    • http://xatefow.sandytoessociety.org/uploads/1/3/0/7/130776760/594ac.pdf
    • http://files.cptoffice.com/uploads/1/3/0/7/130775361/witukuwudabenido.pdf
    • http://files.swbl.ca/uploads/1/3/0/9/130969791/tugejun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/jizibilumitarasukoxik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6695/7722/files/94202445279.pdf
    • https://cdn.shopify.com/s/files/1/0431/2458/8701/files/common_core_math_2nd_grade_addition_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/duplicate_rows_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0462/7234/8309/files/mulezomemevilaziw.pdf
    • https://static.usrfiles.com/ugd/479fa9_fab809a2da5949079e5df95c2fe00e91.pdf
    • https://static.usrfiles.com/ugd/f6a907_118f75b6e2ad4af8880279db5f9dbea3.pdf
    • https://static.usrfiles.com/ugd/4117a9_a6bf409b47524454b10fb09a96917a72.pdf
    • https://static.usrfiles.com/ugd/05900a_ddca5c1eca6f4103bc53b702e527fe35.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_off00007f16.bin
0be61050922f4731a5204348d25179614a6fbe756c4f697582829db041edc48f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F16 5256 bytes
font_01_sfnt_off000090e2.bin
40a55b111c8c21d07f59d7fb1274adb8df24c05ca3781f5dbe15442712573a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x90E2 10648 bytes