Malicious PDF — malware analysis report

Static analysis result for SHA-256 6673427bace54f86…

MALICIOUS

PDF

40.4 KB Created: 2020-09-06 14:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04745287ecb224c6e765c8ef80438016 SHA-1: d08fe6e59abc8bfb9e4f76640b76adde6dfcd464 SHA-256: 6673427bace54f861b4505217b234daefbde633e0eedf384cc8054b5817cf617
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDFs, many of which are hosted on Shopify and appear to be SEO-optimized content farms. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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=preparation+of+aniline+from+nitrobenzene+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/zyrtec_adforum_208.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3607/files/9261000390.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/panasonic_cordless_telephone_with_answer_machine_argos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/magalovadikapimifadalogon.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4224/files/66821545935.pdf
    • https://static.usrfiles.com/ugd/516793_07157a0491244ea78208a8f27845c9c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c959401c0ceb4e5ebe8ae4b67ebb1093.pdf
    • https://cdn.shopify.com/s/files/1/0435/6050/1407/files/africa_continent_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/41219517425.pdf
    • https://static.usrfiles.com/ugd/3283b0_f79bfca5ac6942ab801714b071990329.pdf
    • https://static.usrfiles.com/ugd/f459ea_972eeaaa9c2f483eaf6108b8e8cc0d7d.pdf
    • https://static.usrfiles.com/ugd/bc79a4_72f3204c51e54823a67371c827e3909a.pdf
    • https://static.usrfiles.com/ugd/008e52_afa4414a9c884e5faa00f10c140693a7.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_off00006106.bin
ab0a4e463893bf46c366db5e634e47bfc3f0b97ff4bca267160133bc8b969b8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6106 5200 bytes
font_01_sfnt_off000072a4.bin
02935435910905d76fd5d9d75ad89c262bf27a6fc15c3511ad3b7717dbd35d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A4 9960 bytes