Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33267c6dd605003…

MALICIOUS

PDF

50.7 KB Created: 2020-08-23 05:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f6dc1028e56e46d57925dbc4035c67 SHA-1: 53e71ddbe85a32264619bb769d49a73991375408 SHA-256: f33267c6dd6050038dbb665a8438c085c9850e5aaf769a76c060ca7328756585
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many hosted on Shopify, designed to appear as a salary guide. The primary link, https://ttraff.ru/pify?keyword=cybercoders+salary+guide, is identified as a malicious redirector. This suggests the document is used to funnel users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of specific execution chains.

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=cybercoders+salary+guide
    • http://files.prcpartners.net/uploads/1/3/1/8/131856232/b547258ccd.pdf
    • http://files.vanislandvehicledesign.com/uploads/1/3/1/3/131380596/997cfa.pdf
    • http://zorumot.yrpm.ca/uploads/1/3/0/7/130775565/763de2.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9970/files/gimuxekezasoxexovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/reducing_improper_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/fisiologia_sistema_renina_angiotensina_aldosterona.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/guxamiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/808_bass_samples.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/demon_slayer_retribution_script.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/giwuvebojolotirowaxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6174/6595/files/bts_guidelines_asthma_stepwise.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/absalom_and_achitophel_critical_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/walanuribuwisasiruwonat.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0944/files/50117411983.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/psychology_of_interior_design.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/el_problema_del_alcoholismo.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c8.bin
a639385cdbe8f45694c98265b18b9e394454ba33c883283214283808b6203452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C8 5256 bytes
font_01_sfnt_off000078a2.bin
74f49956a98217f7398675dfbe8f0ec8c7a54a6621d652a8161450301e558c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A2 2264 bytes
font_02_sfnt_off00008319.bin
8446f3381dee84d22904c4d27dde448e8ef19881fe3eab89c1dcfd2f77d94608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8319 10704 bytes
font_03_sfnt_off0000a7e7.bin
4737f6cfef85770128e047f524c2f4cf39220b401ed1e61759cd467f3096abd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E7 16300 bytes

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