Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e0a0be71a05a9c…

MALICIOUS

PDF

31.4 KB Created: 2020-08-24 20:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d20fa3f5d9421d90cf5223dd3a1ad9 SHA-1: 3386000938df89b8e6b2d90d4de4d55c56ff8cda SHA-256: a5e0a0be71a05a9c8d77d7fbe49b326cd9589f518172c34740922799f730540c
92 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a weather report and the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be tricking the user into clicking the embedded link, which leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=last+one+week+weather+report+in+hyderabad
    • http://files.wetsunweekend.com/uploads/1/3/1/6/131637136/pepofixamariwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/rupizera.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/nifunerosakogijam.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/72649451086.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/vosetajot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0166/6969/files/99190644220.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/24739520570.pdf
    • https://cdn.shopify.com/s/files/1/0430/6767/0689/files/38912309107.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_off00003e1f.bin
e0b512306a483bff1286a5055579a78527fa99a3d5bd4ae86e9006caa9e3bf2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3E1F 5356 bytes
font_01_sfnt_off0000505d.bin
2f5b3645717ec75e3f207d18d7ad3dd6975ccd19e16e6aebf258b110840e8654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x505D 9688 bytes

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