Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fb25b527965a46…

MALICIOUS

PDF

33.0 KB Created: 2020-08-19 02:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df022c726c7696ef048553d65cb4402b SHA-1: b3d5f8dc01e86b547cf19f43f369d89bcf60ec86 SHA-256: e9fb25b527965a467040e09dc451658c39b66d32c6cfe51db459ed948cab9b76
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=xfinity+tv+guide+tonight`. The document body also contains this URL, suggesting a lure to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs hosted on various domains, many of which are unknown or potentially malicious. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=xfinity+tv+guide+tonight
    • http://files.inglishmiqlana.com/uploads/1/3/0/7/130776526/godujinomeseraj.pdf
    • http://files.pamsteashoppe.com/uploads/1/3/1/3/131384789/59b03f6f49c09c.pdf
    • http://files.businessrescuene.com/uploads/1/3/1/4/131482954/xaguneperuda-puwejonawup-kugokiwadim-petiwabuvinemet.pdf
    • http://files.dudleycameraclub.co.uk/uploads/1/3/2/8/132815872/dovojosavojonigesi.pdf
    • http://files.shop.packtenna.com/uploads/1/3/0/9/130969389/maxozovopa.pdf
    • https://cdn.shopify.com/s/files/1/0440/5005/5318/files/87918461734.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/penofujosukadotazul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9718/5701/files/berajibosusojiweno.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8663/files/relation_of_demography_and_economic_development.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/bank_secrecy_act_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5832/files/67915171842.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/93423525354.pdf
    • https://cdn.shopify.com/s/files/1/0429/7421/6351/files/detelubuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/google_sheets_round_up.pdf
    • https://cdn.shopify.com/s/files/1/0455/6773/8021/files/21834543831.pdf
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/37756927942.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_off0000457d.bin
dcbbeffd0b9aaec4f703671f7c07c327f4e9604f9f4a4728c5564514e171f79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x457D 4792 bytes
font_01_sfnt_off000055da.bin
c6ef9327a328149f4245815d3b0f742c5cd3027d62dce2f25b0e4fad8a211c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55DA 9832 bytes

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