Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb74cae7cae4a6bc…

MALICIOUS

PDF

58.2 KB Created: 2020-10-27 20:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1129921ddfcdb3178c7571109c579390 SHA-1: 9fd40eeba769a8b02d6585080e5fcbc241d398b5 SHA-256: bb74cae7cae4a6bc5661a6ab47ce9f914240331eae6c4adb80c472f66732db4a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to suspicious domains and identified as part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the overall structure points to a malicious document designed for redirection.

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/123?keyword=high+schools+in+las+vegas+nm
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/717030.pdf
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/ee6808.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/528547.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/tiwazapiwef.pdf
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5f94351bcc259.pdf
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5f95cbba222a8.pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8983cf3de4e.pdf
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f926f9a69b97.pdf
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f873b40ac659.pdf
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5f8a785d1cb57.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f97f94d35e14.pdf
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f877d8023e8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4ca20321-5f86-48c1-8d90-30f0ed42c634/92293629681.pdf
    • https://uploads.strikinglycdn.com/files/947e0e07-5712-450c-abf1-14e1cbadf3c9/14474226926.pdf
    • https://uploads.strikinglycdn.com/files/6a0f6938-0e0d-43b8-80d4-8b260e95d62a/17163136206.pdf
    • https://uploads.strikinglycdn.com/files/94500ca4-f7b3-4da4-8368-34f21200e18c/68545309960.pdf
    • https://uploads.strikinglycdn.com/files/19fa692e-a212-4aeb-b0aa-2dd8e6252827/matalojatufogevasafuguvi.pdf
    • https://s3.amazonaws.com/jutenojamega/bayes_theorem_examples_a_visual_guide_for_beginners.pdf
    • https://s3.amazonaws.com/nonipesikiri/xujarabiluzez.pdf
    • https://s3.amazonaws.com/susopuzupure/74047600061.pdf
    • https://s3.amazonaws.com/gupuso/35740738970.pdf
    • https://s3.amazonaws.com/zirojopemup/psychological_testing_and_assessment_kaplan_free_download.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_off0000a39d.bin
46eec3051996a7d53d6101bdbbf17b9cd9995dbcbf3f7a8f8feb09815770b266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA39D 5140 bytes
font_01_sfnt_off0000b4f7.bin
50cb0cde8dbd1530e83bcc1daa5b9b63f9b14b3fb371a8da9d92d7d2c2516af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 11428 bytes

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