Malicious PDF — malware analysis report

Static analysis result for SHA-256 738740293e839a4a…

MALICIOUS

PDF

43.1 KB Created: 2020-09-08 01:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a72627ec6d65239ee197030dbc1ac4aa SHA-1: b7a7ac8503c99388772cc55a4e35f30619c868fe SHA-256: 738740293e839a4afe09e3c974f54909a6755d5d0e410a1ff9bf9b35282b36df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.me/wix?keyword=zygote+formation+steps, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to seemingly benign PDFs, likely to mask the malicious intent. The ML classifier 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.me/wix?keyword=zygote+formation+steps
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0594/9590/files/denek.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0619/files/university_of_rochester_endowment_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/40154725921.pdf
    • https://cdn.shopify.com/s/files/1/0433/6802/2172/files/bluestacks_4_getintopc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9902/files/71752869103.pdf
    • https://static.usrfiles.com/ugd/cf14a4_89bedb3e06044582866203eea5887bec.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_cb03f2513f3e463fb285629adfe04112.pdf
    • https://static.usrfiles.com/ugd/808d8c_094a877ad18c486c9932fbd4520094f5.pdf
    • https://static.usrfiles.com/ugd/4cd51e_560574f7c8914407bc3072566b0c76d6.pdf
    • https://static.usrfiles.com/ugd/e2a635_1c316c59685545b9afd39f5898d72379.pdf
    • https://static.usrfiles.com/ugd/738632_d7c37b05c35e411697b51b87c440ddc1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9825a9fdc3954a0e9e0552a59b86333b.pdf
    • https://static.usrfiles.com/ugd/4b68be_0b0c0a82f87c420f87d3d89fe5daab7a.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/52057062414.pdf
    • https://cdn.shopify.com/s/files/1/0470/6477/6872/files/britannica_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/descargar_biblia_lenguaje_actual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6851/3695/files/paregexijubibevokadakip.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_off00006d75.bin
d17cd9ecdd1257c74bce2c7cfba27beb96321a856a7ce219f5a2c22da1c8592a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 5248 bytes
font_01_sfnt_off00007f4f.bin
578701cf999b6f8945d16f04e6f68aeb5e64614341bdd106d305ef63eaa8908c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4F 9544 bytes

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