Malicious PDF — malware analysis report

Static analysis result for SHA-256 949e72d9baed89e3…

MALICIOUS

PDF

32.5 KB Created: 2020-08-17 02:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36cef7f052f16d1b196c7a4a94d03b9f SHA-1: e7a91c6d460e0b4d63b793708d319ab5cbf5807e SHA-256: 949e72d9baed89e36abf88774902af45bb84d0d9d2085c03ddc071bbe978861d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, many hosted on Shopify. One of these links, however, redirects to 'ttraff.com', which is identified as a malicious redirector. This suggests a tactic of using a link farm to obscure the ultimate malicious destination. 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=live+overcome+piano+sheet+music
    • http://beteter.eternalpurposeministries.org/uploads/1/3/0/7/130775982/pofezuzip-nezilaf.pdf
    • http://files.myvintagesuite.com/uploads/1/3/0/8/130815437/sabojewi-levozazugazuxod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/76173437924.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/sane_magic_item_prices.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/50934830559.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/39214798373.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/quantitative_aptitude_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/giger.pdf
    • https://cdn.shopify.com/s/files/1/0433/0340/3678/files/59093372000.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/nexojatefesalikij.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_off0000422e.bin
34a75fc7082a82da7e4367dad3bcb93d3d5a4aeba8a46406b9f7e0ae2753a156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x422E 5144 bytes
font_01_sfnt_off00005380.bin
3271fb6e4332a699548546da90d7212726653dafbe39234db2b915b7b3384cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5380 9980 bytes

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