Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e16545d2b785a4…

MALICIOUS

PDF

39.3 KB Created: 2020-08-16 21:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cc6cb23f276bdc0e80d80c1ec4e5982 SHA-1: bd0bc61a027c8ac0d863abbe2600f7db0755ea0a SHA-256: 11e16545d2b785a4b4562bd0cba918359795767d287f1ed2f419c0c668c7395d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to educational materials, likely to trick users into visiting the malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=best+english+language+gcse+revision+guide
    • http://files.tmoonphotography.com/uploads/1/3/0/7/130776655/ratepu.pdf
    • http://kugeba.wanawari.org/uploads/1/3/2/6/132681812/11213e75e.pdf
    • http://zuxuse.bunsandbites.com/uploads/1/3/1/3/131398020/3813930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/xuzof.pdf
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/google_docs_alphabetize.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0731/files/samame.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/gepoxefaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/jamosifepifigofu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/vavitivikitog.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/85380391292.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1519/files/lee_sin_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/14820390667.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/xazejotiloko.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/dilbert_mission_statement_generator.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.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_off00005d1e.bin
53b220ef2c29144b125f8ec42261c3e1105452401433681e9c2f7664d288c250
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1E 5308 bytes
font_01_sfnt_off00006f21.bin
ec2b9adecefa6dff64514f8f4d28f57758a1ebbf9d6f19f01e6b3397dde68ade
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 9752 bytes