Malicious PDF — malware analysis report

Static analysis result for SHA-256 750db40597a00df7…

MALICIOUS

PDF

66.2 KB Created: 2020-08-12 20:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5823f48d758f63ee15f214cd58468cf SHA-1: af8ac74fe1ab879288bba3d0a9719a78ae8c4a10 SHA-256: 750db40597a00df72ca575d3923e3d3e5bc7808f1198ef32c4502d71840ae6b3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. One of these links, https://ttraff.cc/pify?keyword=kambikuttan+2020+march+pdf+download, is identified as a malicious redirector. This suggests the document is part of a phishing campaign aiming to direct 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.cc/pify?keyword=kambikuttan+2020+march+pdf+download
    • http://files.thenorrodsmusic.com/uploads/1/3/2/6/132695828/nisatuduno.pdf
    • http://files.stpetergreene.com/uploads/1/3/1/3/131398046/jomixolisobop.pdf
    • http://files.btwmovie.com/uploads/1/3/0/8/130873717/xufezarepeboxo.pdf
    • http://files.reflectingthelight.net/uploads/1/3/1/6/131636946/2a4474e927d7.pdf
    • http://liwajabab.juliejeanseau.com/uploads/1/3/2/6/132696021/buvunalomosod_pibajabe_raseraxif_muwofetetefamap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/8212/5205/files/dieta_celiaco.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/arabic_language_learn.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/the_ayatollah_begs_to_differ.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/bribery_and_corruption_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/wuzepiriwazinemalabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/17185123582.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3804/files/jupupesixusugite.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/73786756692.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/24405117831.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/arm_dumbbell_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/difference_between_costing_and_cost_accounting.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_off0000c336.bin
f2868cc652898e68f5f052e0eb1f301a4cc9483565cb3b94d4a061e886f00476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 5756 bytes
font_01_sfnt_off0000d6b2.bin
bd66b412f16209c20a970508586fd06b53cb707747b2c13e036c7796fc332e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 10704 bytes

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