Malicious PDF — malware analysis report

Static analysis result for SHA-256 038ee24d6a7167b9…

MALICIOUS

PDF

37.8 KB Created: 2020-07-10 08:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4410724440f932edb01441711c18eded SHA-1: bcfedf914cd4c2600e6cb39c527e6927bce12a48 SHA-256: 038ee24d6a7167b9834ce5de333cc530c5aaec000376129a982db4c1c145a8db
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to external PDF files, indicating a link farm designed for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains keywords related to exam papers and includes the primary malicious URL, suggesting a lure to drive traffic to potentially harmful content.

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=soal%20ujian%20nasional%20sd%202017%20pdf
    • http://files.trkacupuncture.com/uploads/1/3/1/0/131070912/losivejotorepuj_kapimojeje.pdf
    • http://files.karukeramining.net/uploads/1/3/2/7/132710575/2387016.pdf
    • http://files.foxrungroup.com/uploads/1/3/0/7/130776481/ziguluwumimave-lewurab-bokajer.pdf
    • http://files.knottyboards.com/uploads/1/3/0/7/130740538/780744.pdf
    • http://files.gabrielsartkids.com/uploads/1/3/1/3/131379290/1638655.pdf
    • http://files.welearnbyheart.com/uploads/1/3/2/8/132814123/2930099.pdf
    • http://files.marcellakasparart.com/uploads/1/3/1/8/131871467/179947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://saralepexago.files.wordpress.com/2020/07/vuvosumifixixafewixon.pdf
    • https://jaxalevit.files.wordpress.com/2020/06/juwivivajexopiji.pdf
    • https://wupefosa.files.wordpress.com/2020/06/fofis.pdf
    • https://pizitotilu.files.wordpress.com/2020/07/55551965557.pdf
    • https://pegivemabi.files.wordpress.com/2020/06/taliwavaxajazogika.pdf
    • https://botemep98974298.files.wordpress.com/2020/06/dudof.pdf
    • https://kozaxijewob.files.wordpress.com/2020/06/xufosepixefubete.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.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_off000050b5.bin
3f093c742de491945dd1362cf3d1f5ad2d881cf8d0136e9b539e6f9f2bc808e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B5 5208 bytes
font_01_sfnt_off00006272.bin
d35979e7ea2d28f5b6106b84b2832aa1095b67ff82cf9884d27eb53ffa41b1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 12516 bytes

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