Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5b5d6ab54b7425…

MALICIOUS

PDF

43.2 KB Created: 2020-08-20 01:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5be23c1567be70c453c76c7457961d4 SHA-1: 37404dbdf12b461cbae2666c5fd743967f45a8ae SHA-256: ed5b5d6ab54b74257012f621514c6aead439121585b7a16fa4dfdb2a20be6d71
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous links suggests a link farm or a phishing lure, aiming to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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=shakalaka+baby+song+telugu
    • http://files.commonsensemorality.org/uploads/1/3/0/7/130739525/7338053.pdf
    • http://files.completecellution.com/uploads/1/3/0/7/130775126/witaze.pdf
    • https://cdn.shopify.com/s/files/1/0445/6205/5332/files/auriculoterapia_terry_oleson_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/difeso.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/nations_of_the_world_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/westminster_shorter_catechism_with_scripture_proofs.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8827/files/wawebovojuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/netuxujukinofedizekonid.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/zukemax.pdf
    • https://cdn.shopify.com/s/files/1/0439/4926/0968/files/37506536593.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/dieta_para_cido_rico_alto.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0774/files/35722316705.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15501301831.pdf
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/83577373563.pdf
    • https://cdn.shopify.com/s/files/1/0434/4430/6086/files/33479585258.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000611e.bin
c3a50c3a381f993dde66038b53d52fda7f2e54e9a2e5d73814c6bab472de12e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611E 5260 bytes
font_01_sfnt_off000072f9.bin
3845ce4979d17cf6a4665ba69036d95bfa5cabb824a635f6a729de152c9b020b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F9 2580 bytes
font_02_sfnt_off00007e5f.bin
ed56b98d3d7ceaee7729dc0f17c43982d1b262154303bd43519daf44fc05601b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5F 9724 bytes

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