Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa07105c224c15c0…

MALICIOUS

PDF

79.5 KB Created: 2020-11-24 05:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49f483e229247f41bf8616f5aae884c1 SHA-1: 5c1bbbc84b07943b65057710a55f5fc20edf96c1 SHA-256: fa07105c224c15c08d85abe933552758c106ec4085a860fe0e255ffc83ebb90d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru', disguised with a query parameter suggesting 'amazon kindle apk premium'. This indicates a phishing or malware lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=amazon+kindle+apk+premium
    • https://cdn-cms.f-static.net/uploads/4374545/normal_5fbc0d5536dc2.pdf
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f8be35317091.pdf
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f92cd4bab5df.pdf
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f93526b18700.pdf
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f92176999a8b.pdf
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f8d6cdc6126a.pdf
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5fa16881ab501.pdf
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8ee530ed2e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d14e2467-e56f-4c00-a9ba-d91ef7bb985d/trompe_d_eustache_bouche_symptomes.pdf
    • https://uploads.strikinglycdn.com/files/8597dec8-673b-481b-b2c5-4ce97180da99/roperedewikorabusiwuzef.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84c.bin
2289044c88daba3baa18c9b5e61f9f250de5fd6f6536afaf05fb929a435e6530
pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 5032 bytes
font_01_sfnt_off0000e955.bin
7868da33e89effe70c884863272b76c0c6668d65a363b84aca2de5c87bdf0792
pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 15768 bytes
font_02_sfnt_off00011c3b.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 16204 bytes