Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd893b171097227…

MALICIOUS

PDF

59.3 KB Created: 2020-08-12 09:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7ea0e8164addc2b8b8688bf268181bf SHA-1: 1a1788e6db65e33ca65fb149365e090f401863f4 SHA-256: 5cd893b17109722795e869b0f8f84209d2fc6735e0026cbfcdf1acfb0cd0612a
154 Risk Score

Malware Insights

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

This PDF document contains a high number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text appears to be obfuscated or corrupted, but the presence of numerous external links suggests an attempt to manipulate search results or redirect users to malicious sites, potentially as part of a phishing or SEO spam campaign. No scripts were extracted from this sample.

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/wb?keyword=pitong%20sakramento%20pdf
    • http://files.highwayrobberyvintage.com/uploads/1/3/1/4/131406432/276196.pdf
    • http://files.annasboldjewellerydesign.com/uploads/1/3/2/7/132740338/pakofibujuputi.pdf
    • http://files.maccabbeebushcraft.com/uploads/1/3/0/7/130776220/6416538.pdf
    • http://zifuwolax.mnsaf.org/uploads/1/3/0/8/130814328/343ed82.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/competition_analysis_example.pdf
    • https://cdn.shopify.com/s/files/1/0448/1577/7954/files/biophilic_design_research_paper.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/kakefiwaropisozapaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/6486/6469/files/roguwemuwodavujobex.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/30789107968.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/closer_to_god.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/809596258.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/nimobawefajumovufilifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/73444240715.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/juxibexuzu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/ielts_academic_writing_task_2_sample_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a172.bin
8ff8abc7e1e782bb4e7bc237dc5d696cd370d798c3e957a5bab78252b170551c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA172 2008 bytes
font_01_sfnt_off0000aaba.bin
313b97fb88ec7d78726a80b5774b3dddff3ca0809cdfe88ec411dfd7ecbb7850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAABA 5392 bytes
font_02_sfnt_off0000bcfd.bin
fa4defd609d3ece60e63ac818544c7b4956f29fa033217cb40451ef26d700509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFD 10172 bytes

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