Malicious PDF — malware analysis report

Static analysis result for SHA-256 d138f195a83207b1…

MALICIOUS

PDF

74.4 KB Created: 2020-12-25 06:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92e65d104c96005e58913490f52389f6 SHA-1: d7c6412e020490bb3a8643cab0d66fc4a04180cf SHA-256: d138f195a83207b15f3f1d0a77270aecb036ccdf9c05467c71195fd68f942941
154 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it is designed to redirect users to multiple external sites. One of these links, 'https://cctraff.ru/strik?utm_term=do+yellow+light+bulbs+attract+bugs', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to its generation, suggesting it's a crafted lure. The presence of numerous PDF links points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=do+yellow+light+bulbs+attract+bugs
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/wasosebijevesa.pdf
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/kaleguto_vuviwop_xurezox.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/kulezewutabutitew.pdf
    • https://vefarekosisag.weebly.com/uploads/1/3/4/7/134722728/8ab31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefiwegegagu/amazon_prime_fleece_sheets.pdf
    • https://s3.amazonaws.com/goneduzum/spanish_alphabet_pronunciation_guide.pdf
    • https://uploads.strikinglycdn.com/files/ce554585-2718-4407-af6e-178a2c9d66a0/fodusivulo.pdf
    • https://s3.amazonaws.com/fobupojowojon/flute_ringtone_zedge.pdf
    • https://uploads.strikinglycdn.com/files/1b2f24e4-808d-4950-8909-651b6c22888d/march_to_a_million_mod_apk_wendgames.pdf
    • https://uploads.strikinglycdn.com/files/7fa19a95-67ad-4ba9-8058-a4df510e5957/fosevonevin.pdf
    • https://uploads.strikinglycdn.com/files/8df9b813-3857-47b9-ba83-52b02e23c08a/72561491411.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_off0000e470.bin
aec7fcd92190087800dee1fb04e9646be029b2062b9d9ce233bd089b15e410e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 5396 bytes
font_01_sfnt_off0000f6e0.bin
6e560261e01f2eb5d49399ecc679abeaa1d18c014ff82e87d6607d4e2f40a1d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 11136 bytes