Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9918a54474b210…

MALICIOUS

PDF

39.1 KB Created: 2020-09-21 08:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55f2d36f206d342ceb6dbd659c529b3a SHA-1: 7f456c9aaf9bf1a4a5838cda5b134e3d00e154f6 SHA-256: 7b9918a54474b2109310e9639ed6542fdd374ec6cc011151238512a34e2e3b18
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead users to harmful content under the guise of educational materials. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of a malicious redirector and a link farm suggests a phishing or scam attempt.

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.
  • 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.club/wix?keyword=sq3r+worksheets+for+elementary+students
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/30589657624.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/wefikepukezaterewodopama.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/assamese_old_video_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/5th_grade_go_math_textbook.pdf
    • https://239c0621-6b24-4820-b583-fd83210b39a0.filesusr.com/ugd/85c99c_f29b73e435f9423e888bc2b21a0d72cf.pdf?index=true
    • https://8bf284b7-5094-489a-9e23-3ffee4b6475d.filesusr.com/ugd/5cd33b_e1cf0081baff44e88d02c993608d9d21.pdf?index=true
    • https://874417c0-96c1-488a-afa1-68f64a942705.filesusr.com/ugd/d01287_7b18ccc95c3045469cad973ea5f08b9d.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/libavowidoberoweluse.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/nicorette_gum_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8379/files/76348668314.pdf
    • https://cdn.shopify.com/s/files/1/0437/6641/5517/files/4033763339.pdf
    • https://bcae7a92-7cb8-43bb-99cd-28e3c4282b79.filesusr.com/ugd/3bcfef_136647625e7a409988e44d29accb8308.pdf?index=true
    • https://564ca572-86d3-4739-bc55-b8d070c446b4.filesusr.com/ugd/031dda_d1754fa907204bfd95cdc42682b6bf2c.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_off00005a14.bin
18072b72ef77f2ad474a963d2b2f368c135f33848de48e279225b85a56f73226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A14 5796 bytes
font_01_sfnt_off00006db9.bin
317bcf481094ceec8335ed89db99f5e7d08dce37dc84b007a5b0cde755e3b3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB9 9976 bytes

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