Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d4ea1c91172f98…

MALICIOUS

PDF

44.5 KB Created: 2020-08-20 09:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82987a98be81c48d6cfc8f3ab4a1d118 SHA-1: 2d22aeb804ec7a6ee829bc1302886f22bcbdbff8 SHA-256: 66d4ea1c91172f989ae94b5cf2c864124886cb5b316e3bd7391d2b97f6b90fab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to host other PDFs. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains the URL that triggers the redirector, indicating a social engineering lure.

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/pify?keyword=powerpoint+templates+science+free
    • http://files.rockssanddirt.com/uploads/1/3/1/3/131383580/birurisubikof.pdf
    • http://files.lovinglifeguidance.com/uploads/1/3/1/4/131437464/551163b053c4861.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/3001/0263/files/conformational_analysis_of_cyclopentane.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/autocad_2013_keygen_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/sifilimigorafowiko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/cancioneros_de_rock_nacional_para_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0431/9710/4288/files/81160815734.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/25916344810.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9267/files/40733667916.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/85651233433.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/hp_loadrunner_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/2798/8634/files/kuwait_car_park_design_criteria_manual.pdf
    • https://cdn.shopify.com/s/files/1/0452/4336/7581/files/call_of_cthulhu_7th_ed._rulebook_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d7.bin
74baf5b420dc72b466c168b390dab53f269b703e26e45adde835df8ad985a54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 5040 bytes
font_01_sfnt_off000074db.bin
6c743a24d3c11f20c54e41060f7422dec58fe984f42a96f4c71a3060b45a5d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 9900 bytes
font_02_sfnt_off000096ac.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AC 4324 bytes

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