Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc2f1883cc9b4d9…

MALICIOUS

PDF

38.4 KB Created: 2020-08-17 01:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ca2768135d853d6344d8b8d0f9c0b1 SHA-1: ccd5db90cbec77c7d57966dfb326d5f7911d9d76 SHA-256: 5dc2f1883cc9b4d9afde0df83ff73f2cdea571008849e2ad2a47dd097df2c2f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of numerous external PDF files, with one link pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to potentially harmful content through a series of redirects and linked documents.

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=u11+pairs+cricket+score+sheet
    • http://pokulemo.friendsofgoodwinforest.org/uploads/1/3/1/8/131856772/2211040.pdf
    • http://files.delightingingodsword.com/uploads/1/3/0/7/130775286/06eafe78611e.pdf
    • http://files.littlegreenjeep.com/uploads/1/3/0/7/130740207/30d53101217e00.pdf
    • http://files.helenslimestonesculptures.com/uploads/1/3/1/4/131407357/95749689062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/nikerukuzodose.pdf
    • https://cdn.shopify.com/s/files/1/0436/0513/1421/files/lake_guntersville_fishing_report_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/66119890787.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/vumutebamolobamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7607/6188/files/11258766051.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/75739772212.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/62798421770.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/mvp-_pay._msxi._com.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000574c.bin
837f3e1fa1a222d75c30a77f65b5566d70e212d30e4d3f63fb7f26b39cad5ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x574C 5096 bytes
font_01_sfnt_off0000689c.bin
57058db0c4153a31ff132e9ea18d872a34946b7f55ec32014c7bd43489bae791
pdf-font-stream PDF embedded font (sfnt) at offset 0x689C 10708 bytes