Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f18b8a0a6bad609…

MALICIOUS

PDF

43.3 KB Created: 2020-08-24 09:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1887500ba67dd17b378feaaf1a41ded SHA-1: 74f7e2c659bdcf01d5214df3252dc2ccb5bd4970 SHA-256: 5f18b8a0a6bad6094a583a21f9e316fc8325aa780812d59d6b80a023f7c35b8f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a deliberate attempt to create a link farm, likely to drive traffic to malicious sites or to obscure the ultimate destination. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=atresia+de+coanas+pdf+2016
    • http://files.nfspto.org/uploads/1/3/1/4/131438046/lirap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/6344054407.pdf
    • https://cdn.shopify.com/s/files/1/0434/2913/4501/files/luwepudivewavuwowolu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/soxuteza.pdf
    • https://cdn.shopify.com/s/files/1/0430/2081/2441/files/fawofibikelejofuxufewot.pdf
    • https://cdn.shopify.com/s/files/1/0428/0388/8287/files/candomble_bem_explicado.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5848/files/wurid.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4807/files/51602586201.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/tonawimud.pdf
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/3853073127.pdf
    • https://cdn.shopify.com/s/files/1/0439/4886/7742/files/pathfinder_brawler_optimization_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/toziwomeda.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/63299307312.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_off0000631e.bin
669cc816fdd92b607803e9bb92dcc1905345bdef96ba6a502d519ccdacb25196
pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 5584 bytes
font_01_sfnt_off0000762c.bin
11f88c8c2984d2bd9c97339e477377aef38792be60cc09b43dbcedfcc40ba68d
pdf-font-stream PDF embedded font (sfnt) at offset 0x762C 13140 bytes