Malicious PDF — malware analysis report

Static analysis result for SHA-256 37837d1fdc366625…

MALICIOUS

PDF

43.8 KB Created: 2020-08-17 09:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4167b40e4ff1b8392331730b02d1ea8 SHA-1: b6b86175929f6b488fd6c6846f624aac109fbbe8 SHA-256: 37837d1fdc366625e10453830a1204c7d44647df5755d103f7216334289e251a
150 Risk Score

Malware Insights

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

The PDF contains a link disguised as a resume, which redirects to a malicious URL. This is a common tactic for phishing or distributing further malware. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure, and the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are likely malicious or part of a link farm. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=android+developer+resume+2+years+experience+pdf
    • http://zilugexo.bsmga.com/uploads/1/3/1/3/131379552/178ac0ef447dcb4.pdf
    • http://files.vacationgypsy.com/uploads/1/3/0/7/130738673/nolafeseporu-rekabumunuja-mimomok.pdf
    • http://files.thehivespacechicago.com/uploads/1/3/1/4/131453588/labadepujiko-kamowod-xanolereto-xewenudezodimap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/new_holland_tc33d.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/more_speak_english_like_an_american.pdf
    • https://cdn.shopify.com/s/files/1/0435/1901/7124/files/sapifajufon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/28475435076.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39843759369.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/rnorm_function_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/namolipuzewifofuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/japosinumenepofadowudane.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/24799448321.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/scert_physics_textbook_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/watermark_pro_dc.pdf
    • https://cdn.shopify.com/s/files/1/0435/1862/3896/files/xotavukotiraxadusikezudu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4224/files/dnd_5e_giant_toad.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/english_speaking_course_file_free_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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a97.bin
422ed7aea8221ed717d8a024cacc71cded6f00fe308831d71a90512b14c4ad4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A97 5652 bytes
font_01_sfnt_off00007dc6.bin
248f8db50243363d84fb5484de7aa6b790dc3ff54907395f66434fded780c7ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC6 10740 bytes