Malicious PDF — malware analysis report

Static analysis result for SHA-256 282d9346ca7007e3…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 10:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1faf5a2710473c3251358e4d7e8fcc7 SHA-1: 79dbba4dd3f6b937ae05603a6be178ca076d51d8 SHA-256: 282d9346ca7007e37de89b94e0cf46fcda2914219cc54a180c43c5495339c1ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=cron+job+template+kubernetes'. This URL is presented within the document body, disguised as a technical document. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=cron+job+template+kubernetes
    • http://files.atlantatenants.com/uploads/1/3/0/8/130814423/3e75e5b03749bb5.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7544/files/zudinejovuwofelexuvuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/jp2_launcher_exe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.pdf
    • https://cdn.shopify.com/s/files/1/0436/6496/5782/files/vukap.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/gefagamupoxixotigoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/tukosepaxim.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4090/files/compellent_sc4020_admin_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/posidogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1958/files/belgrave_train_timetable.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/99949188500.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6615/files/sheet_music_say_anything.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8998/files/application_form_for_employment_philippines.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_off000064bf.bin
f742661a0ff627ffda5af50217189b3dbb4f018879a5665a0c7fb752a22ac1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BF 5152 bytes
font_01_sfnt_off00007624.bin
dc20ec8ceaaaa085121a837ecee43c0423485d343e972cc711c45ae649bfc9bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7624 10352 bytes