Malicious PDF — malware analysis report

Static analysis result for SHA-256 759dcec942515324…

MALICIOUS

PDF

42.9 KB Created: 2020-08-10 22:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3c443ea888098e636355a3ac4c678f SHA-1: 770f39f1e0a5eeb29fd916cb73e9bdfdd4bc4dcb SHA-256: 759dcec94251532432f349030c1850a80f346632a2c5321eb756e953bc777b74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, https://ttraff.com/pify?keyword=atresia+de+coanas+en+recien+nacido+pdf, is identified as a malicious redirector. This suggests the document is designed to lead users to potentially harmful content through a link farm strategy. No scripts were extracted, and the document body was heavily obfuscated.

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=atresia+de+coanas+en+recien+nacido+pdf
    • http://files.pharmacomedics.com/uploads/1/3/1/8/131857421/91be3a9.pdf
    • http://files.txokgoldstarmoms.com/uploads/1/3/1/3/131381722/novivugemuxi.pdf
    • http://files.prwolvesfootball.com/uploads/1/3/2/7/132710690/942ddd5b.pdf
    • http://files.thepaintedacresranch.com/uploads/1/3/2/6/132682281/0c32c0c1eb604e.pdf
    • http://files.pgtbbytrinaweems.com/uploads/1/3/1/4/131438427/fadukogoz_nijovuketawon_nurimo_ruparumux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/kumijosofanixugaxonogev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0991/6576/files/competition_car_aerodynamics_a_practical_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/bemitesolidawenixulefasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/msp_free_vip_no_survey.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/data_structures_and_algorithms_in_java_lafore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/mips_store_integer_in_register.pdf
    • https://cdn.shopify.com/s/files/1/0434/1035/8423/files/baixar_visualizador_de_free.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/bacterias_gram_positivas.pdf
    • https://cdn.shopify.com/s/files/1/0437/3518/7605/files/51851902841.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/36382901982.pdf
    • https://cdn.shopify.com/s/files/1/0435/9615/2995/files/5193717913.pdf
    • https://cdn.shopify.com/s/files/1/0435/4611/6248/files/low_back_strain_rehab.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/93708001158.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7966/files/form_u_payment_of_gratuity_act_1972.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_off000067fd.bin
243226ce1ff7b0f5732f99d1b535e4ab7eff3048806b92e5bb9208b306af52ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FD 5104 bytes
font_01_sfnt_off00007963.bin
5ff5f5f95387573a81538a966450a7d490daee809807330eb044bf5566cf3ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7963 10632 bytes

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