Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aee5215c0ef71bc…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 08:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ce17695b1b7152d8b02c1f96eae0ca7 SHA-1: 8bb33bf50f48f53fba0300e29c26b0eee21c84de SHA-256: 6aee5215c0ef71bcc080f269f827f4191b7da1363ecb49dfdb957f5ad0c53847
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link, disguised as a user manual, redirects to a malicious URL (https://ttraff.ru/pify?keyword=cakewalk+sonar+platinum+user+manual+pdf). This suggests a phishing or scam attempt to redirect users to potentially harmful content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=cakewalk+sonar+platinum+user+manual+pdf
    • http://lumeve.geniigroup.co.uk/uploads/1/3/2/8/132816202/9e66d.pdf
    • http://belexari.jlkarchitecturaldesign.com/uploads/1/3/2/8/132814930/zuxek.pdf
    • http://files.dirtyapron.co/uploads/1/3/1/3/131382239/6255773.pdf
    • http://files.theleadersoftheheart.com/uploads/1/3/1/0/131070866/vamet-pifagigor-fakuradirekojaf-kewunalenavuk.pdf
    • http://sikug.wtraacaclassicmemories.com/uploads/1/3/1/4/131437736/baliw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6971/9199/files/ccss_standards.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/vicky_cristina_barcelona_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/nukekumuzakom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/72743275555.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/98276589341.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/vepobititumimixunolabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/tuvuxuwuzimexupe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5663/4785/files/80585011369.pdf
    • https://cdn.shopify.com/s/files/1/0436/3727/6825/files/identifying_noun_phrases_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/fiwupufinokivut.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_off0000625f.bin
70a55b904daec51d66d555a3dc973cd622daf7867f8a41bf25537b4f2b7bee3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625F 5248 bytes
font_01_sfnt_off00007435.bin
3e8eae7bb20eb179e4323ee6ddefea6f867e7d9f225889f67d06b45d1d5e36ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 10312 bytes

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