Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f6ed446c4c823f…

MALICIOUS

PDF

51.3 KB Created: 2020-08-21 18:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb1b61a386e2a0eeb49ebc8e504c727 SHA-1: f79125c6e4119305f30079d7b8b989574b07db71 SHA-256: f3f6ed446c4c823f1af79623ffb2c21e2c4cb38d85e5583f6c1413ef097c4f3d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially obfuscated, includes a URL that matches the redirector's pattern, suggesting a lure to external malicious sites. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector and a link farm.

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=suddenly+it%2527+s+magic+movie+sub+indo
    • http://files.buildingfaithwithfun.org/uploads/1/3/1/4/131407144/xufedipiwokewe.pdf
    • http://vuxiropa.maxxseals.com/uploads/1/3/1/4/131453574/kozasenogoma.pdf
    • http://files.oneontapubliclibrary.org/uploads/1/3/0/7/130739525/defuzokuturenomifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/85589629240.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/suluw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/40388425219.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/27643395185.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/64701413331.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/53020049832.pdf
    • https://cdn.shopify.com/s/files/1/0438/1258/5634/files/bulagubabamejisawotuzal.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4629/files/48045167770.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/new_antifungal_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/managerial_accounting_exam_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/business_english_cambridge.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007069.bin
220fe4548407fb4ad6627c03191bb5c63acc3db5325b8d181517778858ae7035
pdf-font-stream PDF embedded font (sfnt) at offset 0x7069 5600 bytes
font_01_sfnt_off00008364.bin
a7be6ba3f3070075da38f4a2fbc24616a4f923a643255d56c9eceeb41c8fc78b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8364 8660 bytes
font_02_sfnt_off00009b88.bin
7923b8b37637b8f148ceb1086c8c330d25572a09d6493a06679f22dd2595ada3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B88 10720 bytes