Malicious PDF — malware analysis report

Static analysis result for SHA-256 1559cbe3bac78183…

MALICIOUS

PDF

49.3 KB Created: 2020-10-10 19:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e3d39ab5fad83dbae60669b8083953a3 SHA-1: e6571c767970d1ec7f13fe81a96b8aa0f5b51938 SHA-256: 1559cbe3bac78183a967226f37f2266234b8567c5ec8902a7ef14bf853ee7bad
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file functions as a link farm, directing users to multiple external URLs, including a known malicious redirector. The presence of numerous links and the nature of the redirector suggest an attempt to lead users to malicious content or phishing sites. Additionally, the heuristic 'SE_CALLBACK_LURE' indicates a potential callback phishing or tech-support scam pattern, where users are prompted to call a phone number. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=chapter+3+practice+test+geometry+answers In PDF document text
    • https://site-1037191.mozfiles.com/files/1037191/ziluvuvekamigojuzakosa.pdfIn PDF document text
    • https://site-1038345.mozfiles.com/files/1038345/24513216107.pdfIn PDF document text
    • https://site-1041301.mozfiles.com/files/1041301/fewimosikovosetazeka.pdfIn PDF document text
    • https://site-1043328.mozfiles.com/files/1043328/5873045177.pdfIn PDF document text
    • https://site-1038525.mozfiles.com/files/1038525/xirifepaxabolokimebe.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/32071789034.pdfIn PDF document text
    • http://files.skywartooth.com/uploads/1/3/0/9/130969080/7125830.pdfIn PDF document text
    • http://files.geniaconnell.com/uploads/1/3/1/4/131438242/3141959.pdfIn PDF document text
    • http://rajupuw.fowhl.org/uploads/1/3/0/9/130969358/53224.pdfIn PDF document text
    • http://files.littlehandsomez.com/uploads/1/3/1/6/131636807/8321914.pdfIn PDF document text
    • http://siweb.carolmeadsart.com/uploads/1/3/1/4/131453960/40bac6d1884291b.pdfIn PDF document text
    • http://bewudif.rxxavv.com/uploads/1/3/1/1/131164239/lupatajel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7443 5484 bytes
SHA-256: 42eb98240dd549ec2192fa8f3c1f82a96ca48f20334d7cc0578af92fc30763c2
font_01_sfnt_off000086d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 10328 bytes
SHA-256: e18bfbe9da3129f4adb203674f6a9b6e283691825ccf9cce30ef7fac76667ee4
font_02_sfnt_off0000aa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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