Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe1e3ea6a9375af…

MALICIOUS

PDF

43.9 KB Created: 2020-08-13 14:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b87849023de3e8a97e1cbb75d64a0f SHA-1: 5bcae6757f4ef900d3a9f8f2463d9f680431bb75 SHA-256: fbe1e3ea6a9375af6e9481be85d6f6eb9be29fdfd7dd7ee81c35f7cbf9c7c978
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=printable%20reading%20worksheets%20for%203rd%20grade'. The document body, though heavily obfuscated, also contains this URL and references to 'printable reading worksheets for 3rd grade', suggesting a lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious. The presence of multiple Shopify URLs, while some are benign, indicates a pattern of using legitimate-looking hosting for malicious content distribution.

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.com/wb?keyword=printable%20reading%20worksheets%20for%203rd%20grade
    • http://files.kateuhlirartists.com/uploads/1/3/1/4/131407668/1301140.pdf
    • http://bikipiro.orrelldesignblog.com/uploads/1/3/2/8/132814007/vozutufidodo-mibuvubav-fudoraxagelib.pdf
    • http://joduv.mikevaninophotography.com/uploads/1/3/1/4/131453133/dupudabalamas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/12977487864.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/fuxovu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/punavudewadaxozegarikutob.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/oxford_phonics_world_1_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/wadafubakozemoka.pdf
    • https://cdn.shopify.com/s/files/1/0439/3412/2139/files/telcordia_sr_332_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobuwavidojanunixi.pdf
    • https://cdn.shopify.com/s/files/1/0443/0761/1804/files/78473985086.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/88490065716.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/eminem_marshall_mathers_lp_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4409/2566/files/pumibega.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_off00005f71.bin
262c1d0caae612f4c1612fe4e9704c614d25e38dc8c9244078bc83591f0f5e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F71 5420 bytes
font_01_sfnt_off000071df.bin
43d5e46073a2f59e5699b2075363cde7a1e00f9776e2ee280fb2f1f1e149c81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DF 10104 bytes
font_02_sfnt_off00009468.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9468 4324 bytes

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