Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efc6df2be56c52d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-18 16:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f8f1a2d207defccb9bd8423734eb4a SHA-1: 0d4cc6931b088d50c9b2255c2ffcab1a4c813266 SHA-256: 0efc6df2be56c52db459534af87351035cdcec36a4067cdd7e795d21a65bd897
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to drive traffic to malicious infrastructure. The document body explicitly mentions "Duolingo apk for android", likely a lure to entice users to click 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.ru/pify?keyword=duolingo+apk+for+android
    • http://files.westernkyelite.com/uploads/1/3/1/8/131857679/kiluj_nojej_vakok_kemifumubigeni.pdf
    • http://files.hildegardsgift.com/uploads/1/3/0/7/130739987/dalurogosugusax_wivufofuzumokeb.pdf
    • http://bemadidum.lomostudiohandcrafted.com/uploads/1/3/0/7/130775557/5007cda49802.pdf
    • http://ruwepi.darrelljamesarchitecture.com/uploads/1/3/2/6/132681611/gozop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/20938038047.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/auditoria_externa_conceito.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/gisuzug.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/90255510961.pdf
    • https://cdn.shopify.com/s/files/1/0438/7697/4747/files/rikatuborevogawoninivomob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/5131209763.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4939/files/banis.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_off00005d00.bin
95ec342fd8dac4004e5037958c6cef45aeb691d5b0ef965c5e8955377d5d6d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D00 5096 bytes
font_01_sfnt_off00006e6d.bin
581ea1e5691055143f9bcf8ce52c7fa6aabd98e06be792c18e939029d3fe5877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6D 10684 bytes

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