Malicious PDF — malware analysis report

Static analysis result for SHA-256 5432a1745876349b…

MALICIOUS

PDF

42.6 KB Created: 2020-11-01 00:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 844f5cb18a4d55658240d94938f885ad SHA-1: d30214c6b838f9bee096722a99b60e30bfba9f78 SHA-256: 5432a1745876349b26a32050c62eb7debe0169b7f30807dafc074d27b0b3b36c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm heuristic, suggesting an attempt to manipulate search engine rankings or direct users to malicious content.

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/123?keyword=macbeth+significant+quotes
    • https://vuxofuta.weebly.com/uploads/1/3/4/2/134235669/61588a.pdf
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/ddc5736a7c03c9.pdf
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f9155abc89cf.pdf
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f881b7a1df3b.pdf
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8727c025cc2.pdf
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/kelelopitajov.pdf
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f8f8779a31da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0478/6834/6534/files/worksheets_kitchen_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0462/9918/5312/files/betejivavozuvot.pdf
    • https://cdn.shopify.com/s/files/1/0503/8725/5483/files/zexifibules.pdf
    • https://uploads.strikinglycdn.com/files/d260884b-ce17-4760-83a5-f20b15bae357/blackletter_calligraphy_guide.pdf
    • https://uploads.strikinglycdn.com/files/25e00f1f-a260-4f09-8abb-c670c6c0d72c/bijeweganojuxosinekawuji.pdf
    • https://cdn.shopify.com/s/files/1/0501/5198/1244/files/innate_immunity_to_malaria.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_off000069ca.bin
d56e9c84173bd044093c1aaa24b929f641752a4dd222de66237bd4cbd45cdc9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x69CA 5288 bytes
font_01_sfnt_off00007bd6.bin
134cc2eb812e2a21a7542d56936677283bf48c63c78c1d9a16536bb813ad97a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 10000 bytes