Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e11d884c235085…

MALICIOUS

PDF

47.9 KB Created: 2020-08-29 04:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b584140eabaae7f8801e0fd4176c665 SHA-1: c456d73f9f9ede9fd496a56dbbcf75ef3fdff81b SHA-256: d6e11d884c2350854623650dd03368cfef8d1c302f5c450cfad1c57c1dc35550
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to '7th grade math notes' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing 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=7th+grade+math+notes
    • https://static.usrfiles.com/ugd/b8c837_5c0101b12be4433f90a782b02d807459.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb27de6cef0b4598afe0d75b800c6143.pdf
    • https://static.usrfiles.com/ugd/b8c837_7499261b048c48148410d7ed21b63506.pdf
    • https://static.usrfiles.com/ugd/b8c837_b979ce8607ed40329994dec60aaaf686.pdf
    • https://static.usrfiles.com/ugd/b8c837_84f53a7387b2460d9cf7875e8b442a5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1ed2993df2487d960fe704b1703569.pdf
    • https://static.usrfiles.com/ugd/b8c837_f638475c55ef479c915449acb3f40f13.pdf
    • https://static.usrfiles.com/ugd/b8c837_263d4133e17c4f9e95aaa360348159d3.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/reduce_file_size_mac_free_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4805/files/how_to_teach_technical_report_writing.pdf
    • https://cdn.shopify.com/s/files/1/0462/6504/1047/files/short_term_disability_appeal_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/rowdy_baby_telugu_hd_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/5038206953.pdf
    • https://cdn.shopify.com/s/files/1/0437/6562/9077/files/grade_12_general_chemistry_curriculum_guide.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_off000066e2.bin
a207e03651bb1bfc8cd097f7a647821710751b68011ce2302cd69b8f3016102c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E2 4932 bytes
font_01_sfnt_off00007779.bin
f1c31e0be4b5d981296ee2480d27930afbc7d9a82cebf90c16395ed77d7ef3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7779 14680 bytes
font_02_sfnt_off0000a4ce.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CE 4324 bytes

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