Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3d628f1ffd63b9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-20 00:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 673dd3b10c3e4858a9469ec4315cfb0e SHA-1: 2dc109592046bb96ad13508e9bb123ae7f79240a SHA-256: 6c3d628f1ffd63b9fe777a8539209ccdddedbedc18799f30efebe78fbf9da5fc
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Mizoram public service commission answer key 2015' and the malicious URL. This suggests a phishing or scam attempt where the user is tricked into clicking the link, which then leads to malicious infrastructure.

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=mizoram+public+service+commission+answer+key+2015
    • http://files.emmanoelleclark.com/uploads/1/3/2/7/132712006/04c9a7.pdf
    • http://files.femindia.net/uploads/1/3/0/7/130775402/4677557.pdf
    • http://files.themedigap.shop/uploads/1/3/1/0/131070309/4ac7f724bfe0.pdf
    • http://duzir.orchestraadventures.com/uploads/1/3/0/8/130874359/b6327499.pdf
    • http://bidobuxus.peterandpaulapixie.com/uploads/1/3/1/4/131454215/kuduj-lumataw-wenuxewud-bofixev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/tuzunavonanufopigogal.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8120/files/lurokogunivarovexowijum.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/22381581296.pdf
    • https://cdn.shopify.com/s/files/1/0439/0685/9163/files/adosphere_1_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/bidarinebumojosakigape.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/gobimiburuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/munuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/11218967952.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/ielts_writing_task_2_answer_sheet_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/banafubujuwusewuwila.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/rigatopuz.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_off00006dd4.bin
5b3fdc69f9a1b2af10e971e7a83b2206946941389c417f4710f46bfb055f4c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD4 6040 bytes
font_01_sfnt_off0000827e.bin
3e11df01cc779a65da73b2dc911d922392a6008e802a423aeb4c355e0bc1a040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827E 9796 bytes

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