Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3f7937afe8666f…

MALICIOUS

PDF

50.5 KB Created: 2020-11-09 16:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39048307f93f278ac1c82246abecd333 SHA-1: 751c167eb50572a4dbab17f32535e94ddb0b0d23 SHA-256: df3f7937afe8666f5c4ba80e29a77d75d75bf6dea9119c2843683140f091356e
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One prominent URL, https://traffmen.ru/aws?keyword=barbara+jordan+commission+on+immigration, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users into clicking through to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/aws?keyword=barbara+jordan+commission+on+immigration
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f94266607f38.pdf
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f881afe00f15.pdf
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5f97fd8982feb.pdf
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/5666024.pdf
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fa0927b8c856.pdf
    • https://bawezinanowele.weebly.com/uploads/1/3/4/3/134305895/ada8e71e47.pdf
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fa2a6ad42933.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wajibile/bose_acoustimass_5_series_v_specs.pdf
    • https://s3.amazonaws.com/fasanag/allen_test_papers_class_8.pdf
    • https://s3.amazonaws.com/dadupawo/marcel_proust.pdf
    • https://s3.amazonaws.com/banula/prefix_suffix_root_word_list.pdf
    • https://s3.amazonaws.com/genedesowul/25492526144.pdf
    • https://s3.amazonaws.com/megulu/greater_than_less_than_worksheets_kindergarten.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_off0000877f.bin
9d194310756faed419200107212e2782f68c7bd54544f669f6a6f2453758b4e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x877F 5492 bytes
font_01_sfnt_off00009a15.bin
89058722845a2ce00621b77792de391252b82fa3d2eabf2559953ab5fcb34a74
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A15 10236 bytes