Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de3c9032514d029…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 20:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c6f8690846c6994c5c708a65748e2a6 SHA-1: a4a8360099af3fe15fcdf7ddfbe867087645a4f9 SHA-256: 6de3c9032514d029d425550eb29de5339a95425114560dc37662f430b9da6e2c
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, including one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'synthesis of benzofuran derivatives pdf' and a URL that appears to be a lure. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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/pify?keyword=synthesis+of+benzofuran+derivatives+pdf
    • http://files.brickhouzecollections.com/uploads/1/3/0/7/130740175/5cd0bc25dc9e.pdf
    • http://files.loyaltybeyondborders.org/uploads/1/3/0/8/130873875/xoneburoduxedetar.pdf
    • http://files.muraleedharanck.com/uploads/1/3/1/8/131857213/8893917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6133/0598/files/federer_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/awaken_the_giant_within_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0261/files/responsible_responsive_design.pdf
    • https://cdn.shopify.com/s/files/1/0440/9013/0584/files/multivariate_analysis_of_variance_manova.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/buburotewoseb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.pdf
    • https://cdn.shopify.com/s/files/1/0428/7456/8860/files/bejozofutuvetozesuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/36994467160.pdf
    • https://cdn.shopify.com/s/files/1/0435/6695/6707/files/44630875955.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/14676590144.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/alita_battle_angel_manga.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/67133171421.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_off00006d8d.bin
70efdfcba72d14945e03eb039e31ea5a5284b3e9b76040ed5a0cf2361aef0c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 5552 bytes
font_01_sfnt_off0000806d.bin
620a98632d6780ddc84468f49461c43adf551bfedd2644011018b20994aa6a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806D 10664 bytes

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