Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60ca5b4293f2454…

MALICIOUS

PDF

40.5 KB Created: 2020-08-17 14:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10ee84a43d3d312fdfadc577e698c183 SHA-1: 0b37c295dd4052ada19c1c8c2f5e5c89cde24f52 SHA-256: c60ca5b4293f24549f50e569c4873e402ba00d63daa3356e62252a8a295f7d63
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a lure for a "counter terror attack hack mod apk" which redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirector infrastructure. The document body itself is heavily obfuscated but contains the malicious URL and numerous other links, likely part of a link farm to improve SEO for 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.com/pify?keyword=counter+terror+attack+hack+mod+apk
    • http://files.corneliawoll.org/uploads/1/3/1/4/131438389/9701758.pdf
    • https://cdn.shopify.com/s/files/1/0431/8733/9413/files/fovabuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/53769937433.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/ossiarch_bonereapers_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/epona_s_song_sheet_music_with_letters.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2048/files/bhagavad_gita_original_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/6965/3663/files/34619526475.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0436/9996/2024/files/centrales_termoelectricas.pdf
    • https://cdn.shopify.com/s/files/1/0437/1120/1435/files/jevudovorimepof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.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_off00005b7d.bin
1f53972ecde987441489f48bb2cb1695ef8ee6808ad96f0088b42a6ce8991bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7D 5072 bytes
font_01_sfnt_off00006c8f.bin
e67f4c4ee17126352a083c3bbcc3320293948f513b1fc1ee47ff8040235c7992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8F 12876 bytes

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