Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7bc58cad0e7f6e…

MALICIOUS

PDF

41.7 KB Created: 2020-08-20 18:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfef9d096aef47a5bc0d294fa43f61a8 SHA-1: 36d07765669614c52e78f087e78a1592d8bd3558 SHA-256: bc7bc58cad0e7f6e7ba2030a2c872daae50da957f43ad9ff6120a9f25fd6f077
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link that is designed to lead users to harmful content. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'character sheet dnd 5e fillable'. The presence of a mass external PDF link farm further indicates a malicious intent to distribute harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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=character+sheet+dnd+5e+fillable
    • http://files.katedmassageandmovement.com/uploads/1/3/1/1/131163718/4589496.pdf
    • http://files.gwynnoutloud.com/uploads/1/3/0/8/130874075/8424640.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/xusizekasiduvalarade.pdf
    • https://cdn.shopify.com/s/files/1/0432/2961/0141/files/basic_python_programs_for_practice.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/sap_hana_training_material.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/eos_70d_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/naxenirasobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/ragabikowikezugivag.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/prepositions_quiz_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5215/files/35577219458.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2952/files/aaoifi_standards_in_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0428/1725/7628/files/tizubew.pdf
    • https://cdn.shopify.com/s/files/1/0432/0837/6482/files/wawojubamizududidulut.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/39379568259.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1945/files/stats_distribution_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/gukisiwibezedopepa.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a7.bin
d40a758d53db75dde7579f05d23609e3321df8ca37d5d315ee380991adf84f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A7 5276 bytes
font_01_sfnt_off0000768d.bin
2c5f6e2947a49a4517d80adccdabc9c1840249f1bdae0e4459270185ae745dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x768D 10248 bytes