Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a68507ca879b9fe…

MALICIOUS

PDF

40.0 KB Created: 2020-08-17 01:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13b165299cd6ec2e60b627f954ff822e SHA-1: 776b5f87bd1f7f6aab2d77ae8b10615307d406b7 SHA-256: 5a68507ca879b9fe138138966f450beedd595b0319263d1cc932704d6d5f33b2
202 Risk Score

Malware Insights

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

This PDF document contains numerous links to external resources, with a critical heuristic identifying a malicious redirector. The document body also contains a lure for downloading attachments, and a heuristic indicates it may be part of a password-protected archive scheme. The ML classifier strongly flagged this PDF as malicious, suggesting it is designed to redirect users to malicious sites or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=gmail++all+emails+with+attachments
    • http://files.danamsd.com/uploads/1/3/2/6/132695493/24e7ff960e.pdf
    • http://files.kiwikainz.com/uploads/1/3/1/3/131398279/2592852.pdf
    • http://files.alexmunroewrites.com/uploads/1/3/1/3/131384173/fovun_jixototedu_pojutebuvatevu_vibul.pdf
    • http://peworav.eleosbooks.shop/uploads/1/3/1/3/131384166/raxujezizevavebu.pdf
    • http://pufowaxu.meowhousecatrescue.com/uploads/1/3/1/3/131384635/zoliboxiw-daniver-fixugazegepu-pisaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/88193994795.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/32778202757.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/84236189611.pdf
    • https://cdn.shopify.com/s/files/1/0431/1954/2434/files/jaxafowuduledurosumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/fivovitumij.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/kojixoluv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/fugupiwufurirakesajaxewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/semonida.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/metal_logo_quiz_answers_level_34.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_off00005e27.bin
99550d95f15cdd15a4ed40c8fc988da1082776691489888dd42a5e940df37260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E27 5064 bytes
font_01_sfnt_off00006f50.bin
7c6fd17303a9792ba06a4446c6812941a6b77935fb5429875dd69647cb36b9a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F50 10592 bytes

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