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) First seen: 2020-09-24
MD5: 4410724440f932edb01441711c18eded SHA-1: bcfedf914cd4c2600e6cb39c527e6927bce12a48 SHA-256: 038ee24d6a7167b9834ce5de333cc530c5aaec000376129a982db4c1c145a8db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links to external PDFs hosted on numerous disposable domains, indicating a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.cc/wb?keyword=soal%20ujian%20nasional%20sd%202017%20pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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 In PDF document text
    • http://files.trkacupuncture.com/uploads/1/3/1/0/131070912/losivejotorepuj_kapimojeje.pdfIn PDF document text
    • http://files.karukeramining.net/uploads/1/3/2/7/132710575/2387016.pdfIn PDF document text
    • http://files.foxrungroup.com/uploads/1/3/0/7/130776481/ziguluwumimave-lewurab-bokajer.pdfIn PDF document text
    • http://files.knottyboards.com/uploads/1/3/0/7/130740538/780744.pdfIn PDF document text
    • http://files.gabrielsartkids.com/uploads/1/3/1/3/131379290/1638655.pdfIn PDF document text
    • http://files.welearnbyheart.com/uploads/1/3/2/8/132814123/2930099.pdfIn PDF document text
    • http://files.marcellakasparart.com/uploads/1/3/1/8/131871467/179947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://saralepexago.files.wordpress.com/2020/07/vuvosumifixixafewixon.pdfIn PDF document text
    • https://jaxalevit.files.wordpress.com/2020/06/juwivivajexopiji.pdfIn PDF document text
    • https://wupefosa.files.wordpress.com/2020/06/fofis.pdfIn PDF document text
    • https://pizitotilu.files.wordpress.com/2020/07/55551965557.pdfIn PDF document text
    • https://pegivemabi.files.wordpress.com/2020/06/taliwavaxajazogika.pdfIn PDF document text
    • https://botemep98974298.files.wordpress.com/2020/06/dudof.pdfIn PDF document text
    • https://kozaxijewob.files.wordpress.com/2020/06/xufosepixefubete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B5 5208 bytes
SHA-256: 3f093c742de491945dd1362cf3d1f5ad2d881cf8d0136e9b539e6f9f2bc808e0
font_01_sfnt_off00006272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 12516 bytes
SHA-256: d35979e7ea2d28f5b6106b84b2832aa1095b67ff82cf9884d27eb53ffa41b1d2

Open this report in the interactive analyzer, or submit your own file for analysis.