Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7d38ff5508dfe4…

MALICIOUS

PDF

48.7 KB Created: 2020-07-14 12:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b787a3897a2acf4ac29d58da067177 SHA-1: 93365ddd4bb3cf330d36ceca97f4afb0947f5634 SHA-256: ed7d38ff5508dfe4ad634ecf30bded65e6ccd2b877a1985f7c4b3340307677fd
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wb?keyword=defying%20gravity%20play%20pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of the malicious link is the primary indicator of compromise. The file was generated using wkhtmltopdf, which is sometimes used to create malicious PDFs.

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/wb?keyword=defying%20gravity%20play%20pdf
    • http://files.arkgrandlodge.com/uploads/1/3/2/8/132814969/pirewutimubixamazux.pdf
    • http://files.jameskallembach.com/uploads/1/3/0/9/130969548/bigat.pdf
    • http://files.soulcafeboldstreet.com/uploads/1/3/0/7/130775554/jafonesuna-zumoneko-gikuw.pdf
    • https://vajepevugu.files.wordpress
    • https://pamowuvesez.files.wordpress.com/2020/06/49318388549.pdf
    • https://wuvigiwutojo.files.wordpress.com/2020/07/49742597765.pdf
    • https://nemejaranola.files.wordpress.com/2020/07/mutirujupozoke.pdf
    • https://difimedo.files.wordpress.com/2020/06/89541573321.pdf
    • https://dumutifojut.files.wordpress.com/2020/06/tavunepuxevoziz.pdf
    • https://vajepevugu.files.wordpress.com/2020/06/davebewatorefadejaworuvep.pdf
    • https://kimetaduwun.files.wordpress.com/2020/06/46175843063.pdf
    • https://wizovepex.files.wordpress.com/2020/06/busisekelatubimuma.pdf
    • https://napipivo.files.wordpress.com/2020/06/topoxobit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88406012193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kamunikizesow.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/fejevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7642/files/lijumevir.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/52413544941.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/vakibawitosavi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/wobemun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/gefagamupoxixotigoj.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_off0000819c.bin
f41736f5b82c7e9e895c2f238a1db9b94616b89eaf1953e1c021628f2cebfc2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819C 4872 bytes
font_01_sfnt_off00009248.bin
108919bd7720f1e2936a3dc82b23f3dd3bced765b3065aedbaf6c5f6268416d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9248 10224 bytes

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