Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ca2772aea99e23…

MALICIOUS

PDF

50.8 KB Created: 2020-08-30 12:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f67f9575c7523b26017ef68bdda0b213 SHA-1: 25a72f881b1d5d6795d5df52a34088bfae446a8e SHA-256: f5ca2772aea99e23eee8fb964bcb0151b3fb3f97e1055d24c02413e64bce2009
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Android usb drivers adb' and the malicious URL. This suggests a phishing or social engineering attack aiming to redirect users to malicious content.

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/wix?keyword=android+usb+drivers+adb
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/15152532582.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/subnautica_kyanite_location.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/beyond_compare_4_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/48242473546.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/52641972776.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/zonepejuwukaduduxip.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/let_go_hillsong_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/5926b4_e13fb4ca2a574cf19ae6856399ffd7e9.pdf
    • https://static.usrfiles.com/ugd/f967ac_c06c80e409a248d5932462191a0d5889.pdf
    • https://static.usrfiles.com/ugd/5438e3_7eab1c430e6e49a299660187848d4bc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f64b48ba92745fcb58da6a16f35c53d.pdf
    • https://static.usrfiles.com/ugd/b8c837_986d6d3f0bde48f389dc74c1d2969c71.pdf
    • https://cdn.shopify.com/s/files/1/0439/1079/1323/files/android_app_browser_activity.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/gujubifubozugajovej.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/data_structure_and_algorithm_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/8630/6710/files/2019_fillable_calendar_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/juzizexupebopuvadipoxunuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d01.bin
8290eef3e2eb61836ece471887268c84bf6f0da1500d2744a9a2d748f3eb4f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D01 4780 bytes
font_01_sfnt_off00008d39.bin
45be93681c0f78236f17d3d77145a53b9b75b3ec36e45efdd3ef6da2592a0538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D39 10480 bytes
font_02_sfnt_off0000b046.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 4324 bytes

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