Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38b7cadba314eb9…

MALICIOUS

PDF

38.6 KB Created: 2020-08-09 14:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4e135e11983148533243f9bcd54a8ea SHA-1: a91213cdf0b5c68b2d93f5248743178f87f0fd39 SHA-256: e38b7cadba314eb9cdd76afb1de4907a5649cd0eb2801e7c638279c894fd045c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though malformed, contains the same URL as the redirector, suggesting a lure to trick users into clicking. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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.ru/pify?keyword=adjective+adverb+and+noun+clauses+worksheet+with+answers+pdf
    • http://files.sundancehorsemanship.com/uploads/1/3/1/4/131453456/6b30de0.pdf
    • http://rebusunag.theseaba.com/uploads/1/3/1/6/131606875/zokazaririsabafudese.pdf
    • http://vojipe.jenniferjoseph.org/uploads/1/3/2/6/132682883/ad329166.pdf
    • http://files.elizabethalsobrooks.com/uploads/1/3/2/8/132814241/d538e5c6.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/safuperumitawomive.pdf
    • https://cdn.shopify.com/s/files/1/0439/1341/2760/files/bulojipafos.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/87478935649.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3816/files/buck_converter_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0583/files/rojufapovavilasere.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/27996346799.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/21387581795.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rakapadanixip.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/fararisusonadesebekobe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/supadurokomumubudisusiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/cat_eye_strada_wireless_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/32158382519.pdf
    • https://cdn.shopify.com/s/files/1/0435/0941/6095/files/spanish_language_beginners.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_off0000561a.bin
4ef27ed908280d7641733930349eb62f0b2faf47909e6e8c671affe16a3a33d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561A 5664 bytes
font_01_sfnt_off00006973.bin
bea3f4b847b35bc5f42ab1d142151f32b3e27efd4f63da9a4272e3a566e777ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 10444 bytes

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