Malicious PDF — malware analysis report

Static analysis result for SHA-256 7707d3472fd989b4…

MALICIOUS

PDF

39.1 KB Created: 2020-08-14 07:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e0d3f2e8ef211733904fcaababa1a25 SHA-1: 49f9d7919a6dc6172b15c0a59870f2b18913477a SHA-256: 7707d3472fd989b407bae2729126a6cd869ae9f97033750f7797b1deaa9fd329
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/wb?keyword=pseudobombax%20ellipticum%20pdf. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links suggests an attempt to distribute malware or phish for information. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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/wb?keyword=pseudobombax%20ellipticum%20pdf
    • http://files.canadiancutthroat.ca/uploads/1/3/0/7/130775520/minagovanem.pdf
    • http://files.fulbrightpta.com/uploads/1/3/1/8/131871864/pomuwavizeta_tobabejodu.pdf
    • http://files.polygonalmind.com/uploads/1/3/1/8/131871778/9bfc331a3cf9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/putedotopafozuvixikijoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/70381243982.pdf
    • https://cdn.shopify.com/s/files/1/0437/3181/2504/files/advanced_engineering_mathematics_by_rk_jain_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/2427/7923/files/wumobopepufolotisupila.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/82263874521.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/33615934948.pdf
    • https://cdn.shopify.com/s/files/1/0440/4304/2966/files/bv_ramana_higher_engineering_mathematics_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71299233386.pdf
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/79028587381.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/22546110206.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/regulamemusutegefepasudej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/39983583260.pdf
    • https://cdn.shopify.com/s/files/1/0446/2454/3907/files/1_minute_10_second_timer.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/budaya_di_malaysia.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_off000058db.bin
c7251ee68b45d745151e4887566019e88229ba1515a2eb47b5023c7257989f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DB 5416 bytes
font_01_sfnt_off00006b34.bin
d81f612e3977b4ff847049ed8c65e6f19f8a3ce892f45d70aa8338f51dd82799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B34 10672 bytes

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