Malicious PDF — malware analysis report

Static analysis result for SHA-256 130850879109a69c…

MALICIOUS

PDF

35.7 KB Created: 2020-09-18 09:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf1f4be80463675c85fa85d32f544f2 SHA-1: a2d3e17c428315103ac1a8deb88121a610231724 SHA-256: 130850879109a69c06f47ffe8942d55f0dad4ec14248646316f7e0b7b88b9c9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Pearl Harbor worksheet answers' and includes the malicious URL. This indicates an attempt to direct users to malicious content, likely for phishing or malware distribution.

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.link/pify?keyword=pearl+harbor+worksheet+answers In PDF document text
    • http://files.999fm.net/uploads/1/3/0/8/130814631/5a6cfe29.pdfIn PDF document text
    • http://files.siahoninfosec.com/uploads/1/3/1/4/131438567/7342377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/xidowekebazudojeredorebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/anime_ost_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/top_buzz_video_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/79592348717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8201/5129/files/difemonagisafitegegaloma.pdfIn PDF document text
    • https://96d2bf39-8a2b-4e07-a626-8300d86fa5d4.filesusr.com/ugd/035627_c842ea8938fc49a89f66b25ed8ef91ef.pdf?index=trueIn PDF document text
    • https://2e3c3b70-62c5-462d-babe-328fbbd25931.filesusr.com/ugd/5befcb_42cfb8af58cf4b6c86e65670813ff01f.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6661/3141/files/navav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/46017653676.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004356.bin
c17fb04ee3d915e65dfc14f49fe6c305fb355357eea4420ccb01439bac52840e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4356 4808 bytes
font_01_sfnt_off000053a9.bin
357224ef66c660acee4d3364e2fc7936a4951aa273994b7e8dd51486614fa3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A9 9636 bytes
font_02_sfnt_off00007486.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7486 4324 bytes

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