Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ab73fc1bc8211c…

MALICIOUS

PDF

41.8 KB Created: 2020-11-07 08:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 167fd668a9d9920d829a5f673eafb5b6 SHA-1: 776b3b771b4e54dda27cef363aa5a646932a8ff6 SHA-256: f7ab73fc1bc8211c139590c6c4f1238ff74f9779987f76b248727aa0ea1594f8
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to a URL associated with malicious activity. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous external PDF links, identified by PDF_SEO_LINK_FARM, further indicates a campaign to distribute content or redirect users to malicious sites. No scripts were extracted, but the overall structure and URL suggest a phishing or malware distribution attempt.

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://cctraff.ru/aws?keyword=roblox+boho+salon+designer+quiz+answers+2019
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5f9cc2096c509.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8aab830f24a.pdf
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5f9fd532541de.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8aca372a692.pdf
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f91a12a79de8.pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8d1921c5f4a.pdf
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fa485a98fdbc.pdf
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f8875c52d27b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gunilagaju.files.wordpress.com/2020/11/90524416601.pdf
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdf
    • https://uploads.strikinglycdn.com/files/6bc773c4-96c0-4ad7-8b7c-1204d949e645/25906482546.pdf
    • https://s3.amazonaws.com/kibavutibeved/banner_of_command_removed.pdf
    • https://uploads.strikinglycdn.com/files/66dd77b5-0c15-4ad1-a3e0-ae56c5855f8c/aptoide_apk_mirror.pdf
    • https://s3.amazonaws.com/tesasubawalozan/92414616015.pdf
    • https://uploads.strikinglycdn.com/files/53cd674a-5f24-43b9-aa0e-dad964292e1e/kogumikis.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_off00006207.bin
f59f0e55b5e3684aea374ba2f2c3bbd371ccbdf588bf54ce1ea68b721f065fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6207 6052 bytes
font_01_sfnt_off000076aa.bin
2bde065d8156a753a760d5103026e9dc4c8b77d00379a3c4212415e32b29b88b
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AA 10404 bytes