Malicious PDF — malware analysis report

Static analysis result for SHA-256 062b22a98b26e7c7…

MALICIOUS

PDF

59.4 KB Created: 2020-07-23 02:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a6bb598d4c73f72e888423831349c65 SHA-1: 0d9d956a124d6d83c6cde88de3f38ef805a50a45 SHA-256: 062b22a98b26e7c7d0d20b68b527b5da0b611c20b4c5cfa2619c448838c9cc7f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to health factors, likely to trick users into clicking the malicious links.

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/wb?keyword=factores%20de%20riesgo%20modificables%20y%20no%20modificables%20pdf
    • http://files.arizonasbestenglishbulldogs.com/uploads/1/3/0/9/130969300/kusugat-zigofo-wisutij-medovaletamun.pdf
    • http://files.virginiabeachmusiclessons.com/uploads/1/3/1/8/131857494/javakekumufu.pdf
    • http://files.imaginelennon.com/uploads/1/3/1/6/131637384/razuwaxe_bubaziwagiz_nuniwo.pdf
    • http://files.ballerzbulldogges.net/uploads/1/3/0/8/130873965/3310842.pdf
    • http://files.southlandvs.com/uploads/1/3/0/7/130776518/6242206.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/60463097093.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/xamirusugotomogivokid.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/banoritawikoz.pdf
    • https://fogamadamin.files.wordpress.com/2020/06/xusabaruma.pdf
    • https://sojiralalili.files.wordpress.com/2020/06/wozibiwasabelosuw.pdf
    • https://norolaxuse.files.wordpress.com/2020/07/98280583798.pdf
    • https://bobunob.files.wordpress.com/2020/07/pivusenolupuxopu.pdf
    • https://zizojika.files.wordpress.com/2020/07/xopotigaxuroku.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/6492540887.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/23509485571.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dofupuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2771/0630/files/bimuluzuwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.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_off0000a644.bin
07b213272f99f064da9e740e6ea1f34ffc42ece732207ddb409e871f6672b9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA644 5460 bytes
font_01_sfnt_off0000b8c1.bin
3c2ae0afc84844bbec3af435bd573414e534ef53aabf57553af04d3e4b125ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C1 11496 bytes

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