Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f7dfeaf7949e1f…

MALICIOUS

PDF

47.1 KB Created: 2020-08-10 03:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 481c99099935bcc4a47d00a861c3c423 SHA-1: e69f1f9fe272c2c5450abbefaac6b3019836ae01 SHA-256: 02f7dfeaf7949e1f862c9ffd2b2d7379782c9a63f3cf4da5967fb36ce9cabe2d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking but potentially part of a larger scheme. The ML classifier also strongly indicated maliciousness.

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=articles+in+english+grammar+with+examples+pdf
    • http://vasanoz.northdevonbiosphere.org.uk/uploads/1/3/0/7/130776485/nasezejegi.pdf
    • http://files.ps173q.com/uploads/1/3/0/7/130739093/tasinebav.pdf
    • http://files.softwashing.com/uploads/1/3/0/8/130874524/pisomova-dureju-wujilavugiro-mawujixavu.pdf
    • http://files.nwaaaufootball.com/uploads/1/3/1/3/131383456/86b9987.pdf
    • http://files.unad.agency/uploads/1/3/1/8/131871424/1475447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/2010/6404/files/wezava.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/schindler_list_violin_score.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/desperate_housewives_pilot_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/furupokexopaxabisovijuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/66366523447.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/m1pr_form_2016.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/anemia_por_deficiencia_de_vitamina_b12_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/monitronics_alarm_service.pdf
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/kidinixagisulilaxatitaxij.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/54957278580.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/18319199972.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_off00006c10.bin
4bb5fadead4407e78801f1ff08d2efafcbb48e6eece00631608524574cb16964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C10 5396 bytes
font_01_sfnt_off00007e46.bin
f41f3b9c40a7a760ab9f4d539dae3321db581e03dde406a36cd82eeb80d9186c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E46 10280 bytes
font_02_sfnt_off0000a140.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA140 4324 bytes

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