Malicious PDF — malware analysis report

Static analysis result for SHA-256 8376f62fd04cb87a…

MALICIOUS

PDF

46.5 KB Created: 2020-08-08 10:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 005f57e7fc7b24a59cd6a11a71ab4488 SHA-1: c52f709cec4e3578dacc5e6f8542d2a6d0fd495f SHA-256: 8376f62fd04cb87a779432515208722af583f198d7e7c0acdada39948b3e5ece
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The document body text, though garbled, includes the target URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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=microsoft+certified+azure+security+engineer+associate+pdf
    • http://files.waltpadgett.com/uploads/1/3/0/9/130969904/fomebapinolugipo.pdf
    • http://files.charterfishingbradenton.com/uploads/1/3/0/7/130775245/lodotolixo.pdf
    • http://files.dearborn411.com/uploads/1/3/1/1/131164383/puvixisumop.pdf
    • http://files.erikaostrander.com/uploads/1/3/0/7/130738636/89d92b7d4e64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/7897/0533/files/calculus_early_transcendentals_7th_edition_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/6922/5625/files/wifezepamabewetarux.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/personal_statement_for_university.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/80803624997.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/vuladuzawup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1023/files/requirement_elicitation_techniques_fast_and_qfd.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/12054226544.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/56046326592.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/36623695948.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/2020_yearly_calendar_with_holidays.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/57099519411.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/analogias_ejercicios_resueltos_para_secundaria.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/74103241188.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_off0000755b.bin
ec0e40df1a8e312b79544ed182b243fcda24cb692c3fc2621807ac06dd664820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 5448 bytes
font_01_sfnt_off00008817.bin
808c7596ee1cb2a00c62ad9484a0a434aa29d2ba5497ed8e17e76243cfdac78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8817 10704 bytes

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