Malicious PDF — malware analysis report

Static analysis result for SHA-256 7617240c947ec1eb…

MALICIOUS

PDF

42.4 KB Created: 2020-07-10 04:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d4bee2ac4200a3e5535384333ccabe SHA-1: 961ffe64b2a996b795db666e04e61cbaea73907e SHA-256: 7617240c947ec1eb38ecd3763d12aed9666996927bb8618bcb3d9f7d14b65d14
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links pointing to external PDF files hosted on a variety of domains, many of which appear to be disposable. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading to malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=herbal%20encyclopedia%20with%20pictures%20pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • http://files.asteadyhandfoundation.org/uploads/1/3/0/8/130813025/lanirajakeguwuz.pdf
    • http://files.km4kate.com/uploads/1/3/0/7/130775856/nunupewakabirelam.pdf
    • http://files.thebody-mechanics.com/uploads/1/3/0/7/130775752/rajodawudezete.pdf
    • http://files.breedingforthefuture.com/uploads/1/3/2/6/132681566/sutavumuz.pdf
    • http://files.bigstridetherapy.com/uploads/1/3/0/8/130874213/8005346.pdf
    • http://files.jiricreative.com/uploads/1/3/0/8/130814001/4762388.pdf
    • http://files.artandsoulholton.com/uploads/1/3/0/8/130874325/ranak.pdf
    • http://files.niagaralearningacademy.com/uploads/1/3/1/4/131408528/lojavawajesun-wuzibulelanot.pdf
    • http://files.7kmetalworx.uk/uploads/1/3/2/6/132680932/vobemixav-foxosetopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://golarunujoki490965438.files.wordpress.com/2020/06/36256357201.pdf
    • https://lasofibile.files.wordpress.com/2020/07/47954496677.pdf
    • https://tugixaforufo.files.wordpress.com/2020/06/1431514260.pdf
    • https://jidinetobix.files.wordpress.com/2020/06/16188069939.pdf
    • https://wavutorusosu.files.wordpress.com/2020/07/75533520477.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80170273674.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40035930655.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27039997465.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006924.bin
39a8ea8ec3994d04baf11143d9a07fb73842b422edf2ffb1d3a69b6c6ab19794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 5420 bytes
font_01_sfnt_off00007b88.bin
ad4c5cdb38417aeb15366ad391d58f917d70bc4640539f6aad750b51976a58a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B88 9628 bytes

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