Malicious PDF — malware analysis report

Static analysis result for SHA-256 8350ef00b2f424eb…

MALICIOUS

PDF

38.6 KB Created: 2020-08-28 06:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d932c85bdbb4ba8af582f885ef327bff SHA-1: 950cd1b9cffe4ee76755e848afcc3fe15d55640a SHA-256: 8350ef00b2f424eb2906ae9ba9f53c30826f93223bf80384ce71848a68a9444c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'solution manual download' and the malicious URL itself. The PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, likely for SEO manipulation or to host further malicious content.

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.com/pify?keyword=electronic+devices+and+circuit+theory+11th+edition+solution+manual+download
    • http://files.capitoloperarichmond.com/uploads/1/3/1/6/131606346/lotomowukumabiguf.pdf
    • http://pijin.brijcommunity.org/uploads/1/3/2/3/132303354/mixawav_lunikufazujakoz_nobikok_segipegaxesol.pdf
    • http://files.coreswinggolf.com/uploads/1/3/1/4/131454521/f8c2df0.pdf
    • http://files.rev-pile.com/uploads/1/3/0/7/130739648/bikuka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/nejogosobegesivot.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0823/files/valve_guide_puller_tool.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/lojedisuxabifodanelibefin.pdf
    • https://cdn.shopify.com/s/files/1/0451/1825/9365/files/stick_figure_games.pdf
    • https://cdn.shopify.com/s/files/1/0437/7654/0834/files/nunarerat.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/sogulegalokamafebidogox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/os_x_el_capitan_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/xotekixuwipogasavajibisom.pdf
    • https://cdn.shopify.com/s/files/1/0435/7115/1007/files/bournside_sixth_form_centre.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/37152348059.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/ancre_hillsong.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/53723234050.pdf
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/rexutupas.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_off0000554f.bin
4938891e85cc4e1f7f2da0ff8b7490d38dd2d4c5f67dd5390126a841f62cefc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x554F 5444 bytes
font_01_sfnt_off000067bc.bin
518ad2a8ba963874770fda7c19fa55cd8b40befdb6f5a296f2b631cefa7ee8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BC 10756 bytes

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