Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f14bfa85efbe134…

MALICIOUS

PDF

43.5 KB Created: 2020-08-10 21:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9127b4438fb54cc1862576fd7ab225ad SHA-1: 64a8df057674fa5958dc2d8c9b05708139c20bd5 SHA-256: 5f14bfa85efbe1347f36dd4061d12a3a7928d79a6eacd5a0bb003d96f4f1a4a9
154 Risk Score

Malware Insights

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

The PDF contains a lure to download a syllabus, which redirects to malicious infrastructure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URLs confirm this malicious redirection. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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.ru/pify?keyword=download+silabus+biologi+sma+kurikulum+2020+revisi+2020+pdf
    • http://files.ruthbeachink.com/uploads/1/3/0/7/130738894/dudobawataze-lorajodu-selimofafelamum.pdf
    • http://files.delislechiropractic.com/uploads/1/3/1/4/131407494/voworoxetexurikoriba.pdf
    • http://files.cisdfoundation.org/uploads/1/3/2/6/132680901/bomivijekugi.pdf
    • http://taguzev.lindsaydiabetesproject.com/uploads/1/3/0/8/130814229/mewawuve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/duvugagizagojilowifode.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/spatial_point_pattern_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0437/6628/4446/files/78638389814.pdf
    • https://cdn.shopify.com/s/files/1/0435/0119/1328/files/small_unit_leadership_a_commonsense_approach.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/kasivikepatinome.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/36780449428.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/vaxavazekigugivavu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/siwovowanaritan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/unity_raycast_hit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/14509286664.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_off0000691d.bin
09e227111eacabce0ffc3c9824c9c18874dbbf7fa71ad7b0b4241dcfadf97f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691D 5988 bytes
font_01_sfnt_off00007d83.bin
32fcc3f320b74d869122934323f682882bd5c75fce5710a0d5a34b87c34cb5bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D83 10372 bytes

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