Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a72edfb027b71c…

MALICIOUS

PDF

52.2 KB Created: 2020-08-10 03:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5345ee4e1a41313a4ce531fa30965a16 SHA-1: 9ee5fc7fa4295b812d1d6ddba3963e50308e673d SHA-256: 62a72edfb027b71c4ef46cb1d27d48433d68248c5bc5dba1d345dbf336dd2ffe
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=afghanistan+war+books+pdf'. The ML classifier also flagged this PDF as malicious. The presence of many external links, including benign ones from Shopify, suggests a link farm or a phishing attempt to redirect users 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.com/pify?keyword=afghanistan+war+books+pdf
    • http://files.saradps.com/uploads/1/3/1/3/131381839/gumevafadobi_zupakofajabi_pazatagivik_vofoko.pdf
    • http://files.seraphimschool.com/uploads/1/3/1/6/131636654/3512908.pdf
    • http://files.metronbi.com/uploads/1/3/0/8/130814492/2535805.pdf
    • http://files.centerschoolpto.com/uploads/1/3/1/8/131856042/d11b9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9795/6258/files/free_brush_calligraphy_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6950/4662/files/reset_synology_nas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0440/3471/9909/files/ligedino.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5621/files/91824725847.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90209356055.pdf
    • https://cdn.shopify.com/s/files/1/0433/6274/6517/files/18920832504.pdf
    • https://cdn.shopify.com/s/files/1/0437/3220/5722/files/bukibulexegagukewab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/my_backup_pro.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/jidizulelusidik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000819d.bin
dff1acd277873cd4bf958db810a8fcb15aac73292e9307ab9e5e13c09b9684da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819D 5228 bytes
font_01_sfnt_off00009358.bin
107ae92f9075c8951958aa4377620d1b1653be6d6d2c32ad33789e41ae890458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9358 10012 bytes
font_02_sfnt_off0000b597.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 4324 bytes

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