Malicious PDF — malware analysis report

Static analysis result for SHA-256 be60ea550e9cb551…

MALICIOUS

PDF

39.7 KB Created: 2020-10-30 04:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 644fe5e7e84567c7bdae81d7333f0640 SHA-1: 178bd851f64b482263ac52c1ec7cbdd1de65e857 SHA-256: be60ea550e9cb551ab59af3bc5e0e3be23f45c708ba8dc1913e530db0c47b8d3
132 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious site for further exploitation.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/123?keyword=chicago+electric+flux+125+welder In PDF document text
    • https://lisoletabe.weebly.com/uploads/1/3/4/5/134511207/f4763c65d6c0fa4.pdfIn PDF document text
    • https://kunulidozejenu.weebly.com/uploads/1/3/3/9/133997834/zujixuwigonoxiz.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/nefomexumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f978f3bf2656.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/lexutedikikiso.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/lopin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f891dbd54a04.pdfIn PDF document text
    • https://tagarimoruta.weebly.com/uploads/1/3/4/3/134320697/bewabelezop-tutele-kezonasavar-boboxujimiw.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/zexos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5b5e25-c74a-44c6-8a9d-cf04528c9435/sejonenowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a4a3e6-c353-41b5-bb61-f6133bb351b7/gofunaku.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/72016197987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fabc00b-9fc0-4de4-b6c8-8f008a6f4b71/.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC6 5480 bytes
SHA-256: 4ad8fef869b411fff44cd54d175d7975eadf90fa1d87ea9600fbd3f0d7ff9cc4
font_01_sfnt_off00006d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D80 10796 bytes
SHA-256: 456d9b550f2c450e0cc0b78537fc64f1adc703618b5e7712df12712ebc0dadd8

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