Malicious PDF — malware analysis report

Static analysis result for SHA-256 027aac6055e16c2d…

MALICIOUS

PDF

40.5 KB Created: 2020-09-17 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41eec1e030cce605965664a0ceb0904c SHA-1: d34349444fffe58fd5b8288c8241f7c6c3d1be98 SHA-256: 027aac6055e16c2da74c57d3f4c5bb2bdce28416c2f4f44164ec3737668ec043
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to link farms designed to host further malicious PDFs. One prominent URL, https://ttraff.club/wix?keyword=free+unblocked+movies+to+watch+at+school, is identified as a malicious redirector. The document body also contains this URL and other PDF links, suggesting a social engineering lure to drive traffic to malicious sites.

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.club/wix?keyword=free+unblocked+movies+to+watch+at+school
    • http://files.westminsterconcrete.org/uploads/1/3/1/4/131408432/mevokimekituwup-rufiw-butifu-konam.pdf
    • http://tegoneju.moonlilee.net/uploads/1/3/0/8/130873851/piposasowolapigunim.pdf
    • http://povofa.sarahmarchand.com/uploads/1/3/1/3/131380771/dupusitarumununoda.pdf
    • http://files.aecnicaragua.com/uploads/1/3/1/3/131379919/nopotonidugo-pekibolufozizi-fuvepiko-papanupivonel.pdf
    • http://dajim.coplandia.com/uploads/1/3/2/7/132740541/vopukiluvoruvol_naloduxefijev_dudej_dokiz.pdf
    • http://files.paqu.org/uploads/1/3/1/8/131871894/vibofukupu_ruzererijolibij.pdf
    • http://files.ekshrine.com/uploads/1/3/0/7/130776511/vukabanakuzef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/5950395399.pdf
    • https://de902cb5-95a5-4487-abb9-4140ef4b4d2c.filesusr.com/ugd/4c1554_da05786978ba4c4f8bdf26c6c0d43795.pdf?index=true
    • https://6a055bb4-173c-4a63-8414-e5661112550a.filesusr.com/ugd/3d0627_b0faa312de2147e296c63764ef003488.pdf?index=true
    • 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_off000060fb.bin
551eaed891ab83339b114b7a462c77f6d98226e78e4251b0abb1f12219405463
pdf-font-stream PDF embedded font (sfnt) at offset 0x60FB 5492 bytes
font_01_sfnt_off00007390.bin
16bbb1168ad804643b32a3dd7f29a95f66b8ed34d8fe56322f455a9bb1bfd642
pdf-font-stream PDF embedded font (sfnt) at offset 0x7390 9924 bytes