Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b25cd994c92c521…

MALICIOUS

PDF

47.8 KB Created: 2020-08-07 21:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5bb750717e5ed3a9bd6189eb002e87c SHA-1: 9e86da89880c6c40cedb649c9224e4a3b7b6daa3 SHA-256: 8b25cd994c92c5211536c62fbf4e60c46841cfa385ae11ec83ab9f5331bf7a9f
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=auxiliary+verbs+be+do+have+exercises+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. 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.cc/pify?keyword=auxiliary+verbs+be+do+have+exercises+pdf
    • http://files.lancasteracademy.org/uploads/1/3/1/6/131606397/1511377d26cd80d.pdf
    • http://files.jbclavaud.com/uploads/1/3/0/7/130776483/zapizasixaweju_medadajogaf.pdf
    • http://files.alliedennydesigns.com/uploads/1/3/1/8/131872087/8904382.pdf
    • https://cdn.shopify.com/s/files/1/0435/2812/6618/files/81200375297.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/zejibakamezog.pdf
    • https://cdn.shopify.com/s/files/1/0440/0264/0030/files/bridget_jones_mad_about_the_boy.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/mokowexu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/72932011978.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/rixamuxemabemozan.pdf
    • https://cdn.shopify.com/s/files/1/0429/1313/6799/files/96510273496.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/watixijewep.pdf
    • https://cdn.shopify.com/s/files/1/0435/5178/5109/files/51030038963.pdf
    • https://cdn.shopify.com/s/files/1/0446/3670/0835/files/brave_new_world_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/real_estate_api.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a1.bin
4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A1 1684 bytes
font_01_sfnt_off00006f05.bin
382af1c30bbe2592de0c81606ef1c13096a92d3be2f0d680201491c3256e977e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F05 5300 bytes
font_02_sfnt_off0000811c.bin
9f945d9992ac064f7e12decc7327e6c8ae425b2f7d079cea3e1d09e1ba3960b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811C 10120 bytes
font_03_sfnt_off0000a3ca.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3CA 4324 bytes

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