Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e926aaa9709adc…

MALICIOUS

PDF

34.4 KB Created: 2020-08-03 14:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb5fc4d636f18d078979edfad83facb7 SHA-1: 050f7519f5f6c57ec6b4fe539a19c9a607157192 SHA-256: 71e926aaa9709adc945a9f7e1f42fd644d2204174b8d8aa1d767db2fe65f9ee6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, suggesting it is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text related to 'Cambridge English proficiency 2 answers pdf', indicating a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=cambridge+english+proficiency+2+answers+pdf
    • http://files.horizondrivereducation.com/uploads/1/3/0/8/130874257/02f8f1fb706e0.pdf
    • http://files.holisticimpactfoundation.org/uploads/1/3/0/7/130739480/tolosidimamirol.pdf
    • http://files.enjoylivingabroad.com/uploads/1/3/1/3/131379356/186b78.pdf
    • http://files.delaneyswiftart.com/uploads/1/3/1/4/131453598/6df31149.pdf
    • http://files.firstpresperry.org/uploads/1/3/1/4/131407080/2414401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5277/7128/files/bobugatemirebofojax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/26878471677.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/sujesolanulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/59010096467.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/25012493861.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6834/files/jumetifuwitobiboxijemufe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/dafot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/gawozudunimejatiwika.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4899/files/ravimimiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/lupekerowowedidugalokov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/mijesafepulo.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_off00004953.bin
801b4c9149442285499f0d03d12f5076547af515a65bbfaf4d20336c71dfd8fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4953 5940 bytes
font_01_sfnt_off00005d6c.bin
8b7215343efb1a6430e1139a05cf3985de3b53946c82889eb40bcbeea6745dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6C 9236 bytes

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