Malicious PDF — malware analysis report

Static analysis result for SHA-256 3455ad55134ee0f8…

MALICIOUS

PDF

44.2 KB Created: 2020-08-15 23:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9badee2d2fc4d2f4dfe6ec9fb55bd547 SHA-1: 9e2dfbe7e72f6c92efdcbade0eb20c04c55a5c21 SHA-256: 3455ad55134ee0f8e3fd4fe11da39023dfcc53b2433db3b8a76bfaf31ebbbd97
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service and algorithmically generated URLs, indicating a link farm designed to host malicious content. The document body, though partially corrupted, contains text related to 'subtraction word problems grade 2 worksheets' and a URL, suggesting a lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/wb?keyword=subtraction%20word%20problems%20grade%202%20worksheets
    • http://files.swflreview.com/uploads/1/3/1/4/131483201/zigovowefub_dinemiwo_balif_pujakagerujikoj.pdf
    • http://gasuligoj.sarasotacountysurplusproperties.com/uploads/1/3/2/7/132712207/zubewi-rezapes-pinudugekag-koxezukitatim.pdf
    • http://bozonum.therosievida.com/uploads/1/3/0/9/130969723/5886455.pdf
    • http://files.tzilvelis.com/uploads/1/3/0/7/130775084/eda2bfc0d3d9d5f.pdf
    • http://faxafixo.defiesmeasurement.com/uploads/1/3/1/6/131637316/476471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4536/files/klasifikasi_tanaman_binahong.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9631/files/47518704021.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/54926904799.pdf
    • https://cdn.shopify.com/s/files/1/0436/9576/7706/files/symbolic_violence_definition.pdf
    • https://cdn.shopify.com/s/files/1/0440/0365/5830/files/engineering_drawing_for_beginners_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/beganudi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/66789023402.pdf
    • https://cdn.shopify.com/s/files/1/0434/5502/1206/files/46172397430.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/vogogubufake.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_off00005ec7.bin
7da44c40e42c611bf674e09308674aacec7a3a683e788d482e03be351c20a793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC7 5900 bytes
font_01_sfnt_off000072b2.bin
6c86d6725b3c03d871c26f5203f74d9e5a49df27b80e02b6fb27cc0419d70c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B2 10172 bytes
font_02_sfnt_off00009573.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9573 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.