Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e4f41a5d8d5b99…

MALICIOUS

PDF

56.8 KB Created: 2020-09-03 02:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0752b6066ccbab9c12d27208c330c8e SHA-1: 09ac6f6eac07c21a253fde297575959f527eab25 SHA-256: 86e4f41a5d8d5b9984078a26033a49f6539c5aaddef71db14fc27a24d305895c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL leading to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the redirector URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.me/wix?keyword=angular+4+confirm+password+validation+template+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0522/2813/files/pejolesadogowiku.pdf
    • https://cdn.shopify.com/s/files/1/0463/3926/0573/files/niwisudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7119/2732/files/fijokubefitibanigivef.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/casio_illuminator_calculator_watch_manual.pdf
    • https://static.usrfiles.com/ugd/e0d0cf_c3d3dba258bf4d3789bb4a6a11cfdfd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_80a536615bd64cce9ba8fc579b7dd666.pdf
    • https://static.usrfiles.com/ugd/b972d5_8850a232ab8c44639b72182f820ccf54.pdf
    • https://static.usrfiles.com/ugd/9a242c_e32dd374ef664ad3bd0cd1444a959f65.pdf
    • https://static.usrfiles.com/ugd/b8c837_75af4c98b558483ab5b7d42cc283ab75.pdf
    • https://cdn.shopify.com/s/files/1/0446/9778/0380/files/vokowifevifob.pdf
    • https://cdn.shopify.com/s/files/1/0466/3079/7477/files/48917239040.pdf
    • https://cdn.shopify.com/s/files/1/0435/8671/5805/files/94250040984.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/fetilokenafifevenovaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/boardwalk_empire_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/rulavowiven.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_off00009338.bin
afde4e9e0439e8426662cc692f25636be3bf228d16cbb15f7c180e8b603f86f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9338 5704 bytes
font_01_sfnt_off0000a6b7.bin
6a5308b3e4113476717c36a64315ebfb9ee41325489ffe2ad24c688c7ba535cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B7 15296 bytes