Malicious PDF — malware analysis report

Static analysis result for SHA-256 4456d6bfcbd9e5b8…

MALICIOUS

PDF

46.6 KB Created: 2020-08-10 02:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3b16b0160f47c0f4381e240cc2f069 SHA-1: 98ce28c30c60cd5cdd4fd4433bc863bfda3ee1e3 SHA-256: 4456d6bfcbd9e5b80930a8b2eafb1dbce74b164d550b16bbda8ce05965fbf130
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious URL identified is https://ttraff.ru/pify?keyword=character+analysis+questions+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise malicious content as legitimate documents. The ML classifier strongly supports the malicious verdict.

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=character+analysis+questions+pdf
    • http://rixez.projectreturnmilwaukee.org/uploads/1/3/0/7/130738970/6326142.pdf
    • http://files.prbydenise.com/uploads/1/3/0/8/130813409/tozakasafifiw.pdf
    • http://files.gleimlight.com/uploads/1/3/1/0/131070113/lemofutalaxix-rapit-lomusawor.pdf
    • http://fafifon.ceremoniesbylorrainewafer.com.au/uploads/1/3/0/9/130969489/2069738.pdf
    • https://cdn.shopify.com/s/files/1/0446/6973/0979/files/panera_bread_lunch_menu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/83864435277.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/mogikavawirikifowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/sadulikininigeraji.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/amines_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/13623455973.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/98678105012.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/51823789401.pdf
    • https://cdn.shopify.com/s/files/1/0437/9249/8850/files/lazixoxibav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/10th_maths_guide_tamil_medium_download.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_off00006a9c.bin
e24938909f933b7350b3778a585e11b4e6223e972e3ab819a56ac67e47511c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9C 5376 bytes
font_01_sfnt_off00007cdd.bin
b5cc69ebc1b54e91691752b147f4d7046b6942e8a9cbf5ce4a6d26c239ee1ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDD 10048 bytes
font_02_sfnt_off00009f25.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F25 4324 bytes

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