Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc0a6a8d8ee1318…

MALICIOUS

PDF

32.7 KB Created: 2020-08-21 19:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe14d5f16bab183d80b8a2c418810a8 SHA-1: 6c7c77a8f79f315a304e9bb75107a66f6ba50eef SHA-256: 4fc0a6a8d8ee13183cbb05cb8efc8739b629e2c9d60872393499689a35d64cea
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic indicates a direct link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily corrupted, contains text related to 'Jolly phonics letter sounds worksheets' and the malicious URL, indicating a lure to a malicious site. No scripts were extracted from this sample.

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=jolly+phonics+letter+sounds+worksheets
    • http://gumoxu.mayfairmusic.com/uploads/1/3/0/8/130814328/wegibox.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4162/files/juniwuvowep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/python_interview_questions_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/destiny_2_forsaken_imdb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/vikigosaki.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/cercle_circonscrit_au_triangle.pdf
    • https://cdn.shopify.com/s/files/1/0435/6407/3128/files/fopepikiwitikaletulure.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/guitar_chord_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/lolimarafugukifunikad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/10534216784.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_off0000418c.bin
2fc6831ba379d85acec05422e37560f44b23e8ddc4e3b897e2931440ab27c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x418C 5200 bytes
font_01_sfnt_off00005346.bin
efa143417b15727cac1a8bd0f77dc0cc35c2b989455f6ac8d0a222c75e3931a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5346 10208 bytes

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