Malicious PDF — malware analysis report

Static analysis result for SHA-256 239b20421d7132d4…

MALICIOUS

PDF

49.7 KB Created: 2020-08-17 06:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f9d8044b7a7ab8cfc9e60f3864efda SHA-1: 1aa5504cfed151066bad06687ed02ec2c1070450 SHA-256: 239b20421d7132d4dc42b433c01f1bda6809688af135d4e4dfddf6f7b2fc2102
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised as a download for 'Android tv apps free apk'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this malicious intent. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The ML classifier also strongly flagged this PDF as malicious.

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=android+tv+apps+free++apk
    • http://pumopilu.yaleclubofutah.com/uploads/1/3/1/4/131437246/1520062.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/fafowepok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/wow_classic_mage_leveling_guide_1-_20.pdf
    • https://cdn.shopify.com/s/files/1/0432/9966/8121/files/85539229532.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/98804262031.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/jizizadofaritugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/34315329229.pdf
    • https://cdn.shopify.com/s/files/1/0432/4121/0024/files/40204933347.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/72141646541.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5900/files/biocontrol_of_plant_pathogens.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_off00007b3a.bin
0634d589053e0a027293cea055651f73077650abb8e86411830508d45e49b32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3A 5116 bytes
font_01_sfnt_off00008cbc.bin
97611e84fb9f32a26719c9d5e0aad2f9602ff3527a70ccca2a2dc594bc33afc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBC 14560 bytes

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