Malicious PDF — malware analysis report

Static analysis result for SHA-256 5924e163a5d42b11…

MALICIOUS

PDF

45.1 KB Created: 2020-08-19 00:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11df70c9268c2cf639bff0ce2c2c72a9 SHA-1: d989b6190e571613da908fb9833f987f3503694e SHA-256: 5924e163a5d42b11d17fdf25e508106e83f36e152b49e8e4740321f46981cad0
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=year+6+short+division+worksheets', suggesting a lure to a malicious site disguised as educational content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=year+6+short+division+worksheets
    • http://sogulot.shapebham.com/uploads/1/3/1/4/131452958/e23ef01.pdf
    • http://files.kazquilting.com/uploads/1/3/2/8/132815050/digiruvijiboror.pdf
    • http://files.regalpropertymgmt.com/uploads/1/3/0/7/130739831/6513720.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/buguk.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/jezifamorubotijat.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2475/files/53819813323.pdf
    • https://cdn.shopify.com/s/files/1/0434/7559/9524/files/790493476.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/59402129990.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/dajekoxuvepijutululi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/catena_aurea.pdf
    • https://cdn.shopify.com/s/files/1/0448/1220/6241/files/busodigotosoriribomare.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/xejubigomejog.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_off00007256.bin
dd66e5e06650a7e83641135f66a7894de2c1d454f275d078a16f85f762dfaffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7256 5212 bytes
font_01_sfnt_off00008425.bin
3fd8879c96163a7224674b7c3334b8753b6e3054cfc1fb1fa8515c9daf6659fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8425 10468 bytes

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