Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ad67a3507f3756…

MALICIOUS

PDF

43.1 KB Created: 2020-08-30 23:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7766b1077d55d8771e13040f4c0f8073 SHA-1: 6f89f9f7026d6597d38939bd225042911e997214 SHA-256: 75ad67a3507f3756fb902e8a231fc52bac263b83ac2be2ce025349bd9305aed2
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector to `https://ttraff.ru/wix?keyword=rubik+cube+2x2+solution`, indicating a link farm or phishing attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links, including a malicious redirector, suggests an attempt to lead the user to a compromised or malicious site, likely for further exploitation or credential harvesting.

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.ru/wix?keyword=rubik+cube+2x2+solution
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/45575753157.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/starbucks_employee_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/nice_guideline_dyspepsia.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/71470630783.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/34719792638.pdf
    • https://static.usrfiles.com/ugd/2c8d66_e2daca34d106406c935b82e4f21ac0d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_59576f33e5104edd9ab1cbd62367a1f5.pdf
    • https://static.usrfiles.com/ugd/c83fdb_292f10fd423c4143b339ad807236026a.pdf
    • https://static.usrfiles.com/ugd/d99ef3_4b93a80492164543b4a559767665ef31.pdf
    • https://static.usrfiles.com/ugd/510a18_c51f96aef8554721ab19937ee58546d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7639605d2e23480d8678cb82f7e0aed6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b89e0df680240afac0dccc363cee84e.pdf
    • https://static.usrfiles.com/ugd/4c76bf_20a11f814d7048e6947e82af0181440b.pdf
    • https://static.usrfiles.com/ugd/238140_1952f848d8c24a769b6fe86620d3fc11.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/themeforest_email_templates.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/edith_hamilton_mythology.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_off00006b53.bin
d1a5fb8bc1e000df9de6a617bc57bd105951095552b8c25e32dda215773e33dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B53 4896 bytes
font_01_sfnt_off00007c1a.bin
655682d40d355b710505be9878875f4f3fedd70716e136b59c524c9ac3885347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1A 10272 bytes

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