Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcc435475b40f0f…

MALICIOUS

PDF

47.1 KB Created: 2020-08-13 05:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca314597397418a702d8880b02c4a4c SHA-1: cf13300de663fa07e384ef644bf7e913e7dd9838 SHA-256: 2dcc435475b40f0f7ab847b919f0579e83ae2eccd8209acbe21a1dd22b640240
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, masquerading as a document about stress management, which is a common lure for phishing or malware delivery. The primary link, 'https://ttraff.ru/wb?keyword=how%20to%20manage%20stress%20in%20life%20pdf', is flagged as a malicious redirector. The document body is heavily obfuscated, but the presence of numerous links and the malicious redirector strongly suggest an attempt to lead the user to malicious content.

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=how%20to%20manage%20stress%20in%20life%20pdf
    • http://files.oakleyboycott.com/uploads/1/3/0/7/130776861/c7884ab2cd93e4.pdf
    • http://fosew.lindyphysicaltherapy.com/uploads/1/3/2/6/132695550/8678130.pdf
    • http://files.brisbanefamilyhypnotherapy.com/uploads/1/3/2/6/132696512/af3614957eb860b.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/2806633007.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/1200433164.pdf
    • https://cdn.shopify.com/s/files/1/0454/3473/2712/files/togaf_archimate.pdf
    • https://cdn.shopify.com/s/files/1/0434/8723/2166/files/gorarisasuje.pdf
    • https://cdn.shopify.com/s/files/1/0452/7095/8241/files/approaches_to_classroom_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/2129/5003/files/61877170560.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/middle_finger_ascii.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/ruxewuziwijuzut.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/22796623924.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/icao_annex_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/swedenborg_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/81295634924.pdf
    • https://cdn.shopify.com/s/files/1/0435/3543/3882/files/hdfc_life_opportunity_fund.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079cc.bin
412db37d0a3a4ddb500a1a7fd107fa7826f1b28b8dcaef35976b7d3840e8e4d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x79CC 5416 bytes
font_01_sfnt_off00008c2a.bin
1cd63f872bddd78ff7760077d64c0dd8718d64df4522facdb845eb773a7fbb31
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2A 10400 bytes